* Patch from Serge Anvarov with some optimizations (bugMantis 0036143)

* GlobalNameSpace must EndWrite before it is released to unlock the critical section

* make TProxyStream.Check an abstract method; as it is right now one had to override it anyway because it always raised an exception

* Add deprecation message

* Fixed Issue ID38920: twriter crashes on readonly nil component

The TStream.ReadBuffer and TStream.WriteBuffer methods have changed the Count parameter type to NativeInt.
Changed the implementation of ReadBuffer, WriteBuffer so that the size of the blocks when calling Read and Write does not exceed High(Longint).
Notes:
- Thanks to this change, for example, a file larger than 2GB can be loaded into TMemoryStream.
- The fact that the Count parameter has the NativeInt type is compatible with the latest versions of Delphi.

fix wording of error message when field not found during reading of lfm file

* Remove component from previous owner. Fix issue gitlab 0039529

* Small safety precaution

* Added Read64/Write64

* Micro-optimization. Fix issue gitlab 0039617

* Move() check for identical index. Additional fix for gitlab 0039617

* Add Flush method to TFileStream. Fix issue gitlab 0039619

* Add some delphi compatibility enumerateds to TShiftState

Better TBits.

* more robust calculation of TBITS_SHIFT

* Char -> AnsiChar

* Add MainUnit

rtl: TReader: FindComponentClass using field name and classname

* Adapt classes to Unicode RTL : Give string/char correct type depending on case

rtl: TBinaryObjectWriter.Version

rtl: added overload GetClass(UnitName,ClassName), implemented UnregisterClass, overload TStream.WriteComponent(Instance,WriteUnitName)

rtl: ObjectBinaryToText, ObjectTextToBinary: support unitname/classname

* Better Ansi/WideString support for TStream. Fix StringStream with unicode to be delphi compatible

rtl: added TBinaryObjectReader.BeginComponent

* Avoid useless exceptions by checking existence of resource

* Fix windows compilation

* Resource handle is not resource ID

+ add function reference suitable overload of TThread.ForceQueue()

* change Result of CheckSynchronize to true when at least one method was executed (matches with both FPC and Delphi documentation)

+ support 16-bit pointers in TFPList.IndexOf

rtl: classes: added parameter aName to TFindComponentClassExEvent

* Small optimization of WriteIdent. fixes issue gitlab 0040334

* Deprecate hextobin

* (modified) patch by Jinyang He to handle alignment in FindInFieldTable correctly, resolves gitlab 0040400

* Fix issue gitlab 0040454

* Fix OnChange being fired twice when adding an object. Fixes issue 40261

* Fix issue gitlab 0040180

* Some delphi compatibility types and consts

* Add delphi-compatible observers to classes

* Add GetMulticastObserver

* Add TStreamOriginalFormat for Delphi compatibility

* Delta stream support

* modeswitch needed

* Add SkipValue to TReader

* Add TReader.ReadPrefix for Delphi compatibility

* Add ReadDouble

* Fix wrong typecast

* Not all OSes have NilHandle

* Fix wince/nativent compilation

* Add CreateAnonymousThread with anonymous procedure

* Add Current and CurrentIsMain

* Change GetSystemTimes signature to be delphi compatible, implement for linux

* Move move free notifications to separate procedure. Fixes issue gitlab 0040638

* Make TComponent.GetObservers virtual and protected for Delphi compatibility

* Add TReader.SetName for Delphi compatibility

* Add TestStreamFormat

* Correct UTF8 detection

* Add support for vaDouble

* Forgot to commit.

* Add TReader.ReadStr for Delphi compatibility

* Fix signature of TReader.SetName

* Overloads for TResourcestream.Create

* Keep old behaviour, but keep issue gitlab 0040898 solved

Remove most of the VER3_0 conditionals.

* Properly nest beginupdate/endupdate in doaddobject

* Remove superfluous initialization of local variable. Fixes issue gitlab 0040917

* Patch from Alfred Glänzer, fix FindComponentClass to use actual typinfo structures. Fixes issue gitlab 0041000

* Patch from Amexander Bagel to restore Delphi-compatible behaviour in TThread.Queue. Fixes issue gitlab 0041043

* Patch from Bart B to improve Slice(). Fixes issue gitlab 0041068

* TBasicActionLink.Update must always return value. Fix issue gitlab 0041070

* IInterfaceListEx

* Small optimization. Use SameText instead of uppercasing both strings

* Result needs to be assigned when doing FindInFieldTable

* Parser buffer are ansichars

* Make sure BOM marker is correctly compared

Add Contains() to lists and stringlist

* Add ContainsObject to TStrings. Patch from Bart. Fixes issue gitlab 0041405

* Use SizeInt when checking inside strings. Fixes issue gitlab 0041414

* Add delay parameter to ForceQueue for Delphi compatibility

* Remove debug statement

* Allow Reverse to be used on Self. Copy objects as well. Fixes issue gitlab 0041508

* Handle OwnsObjects when doing revert on self

* More efficient algorithm for reverse in case Self is passed. By BrunoK

* Use new pause intrinsic for platforms that support it in TThread.SpinWait

Fix typo in last commit

Fix compilation with release compiler

* use also fpc_riscv_pause

* Add intrinsics unit for ARM platforms

Replace unused AARCH macro by AARCH64

* Fix freeing wrong list. Fixes issue gitlab 0041530

Fix LLVM rtl compilation by disabling yield/pause inside TThread.SpinWait method

Add intrinsics dependency in classes unit for several OSes

Only add intrinsics unit dependency for trunk branch

Add fpc_ppc_yield call for powerpc/powerpc64 CPU

Add intrinsics unit dependency for powerpc and powerpc64 CPUs

Use FPC_USE_INTRINSICS macro to use compiler pause/yield intrinsics function

Set FPC_USE_INTRINSICS when appropriate for most platforms

Do not use FPC_USE_INTRINSICS on some old target OSes

Set FPC_USE_INTRINSICS after _USES clause for i386 and x86_64

Fix syntax error (missing $endif)

Also disable FPC_USE_INTRINSICS on i386 and x86_64 if LLVM or for version < 3.3.1

Fix erroneous double inclusion of classesh.inc file