+ Add handling of simple types and constants
+ Add ReadID helper procedure inside ProcessH2PasChk method

Use %X instead of %x for C hexadecimal constants as Free Pascal hexstr uses uppercase characters A to F for values 10 to 15

* tests with Delphi showed that an attribute class must explicitely declare a parameterless constructor if it should be used, cause TCustomAttribute.Create is private
Note: this also means that TCustomAttribute itself can not be used as an attribute
* adjusted existing tests
+ added test

Avoid range check error for functions returning THandle type by using unusedhandle system constant

* remove unused constants

Fix LLVM compilation by casting untyped real constants to double type, as LLVM does not support extended type constant apparently

Revert wrong change, llvm supports extended constants

rtl: make STACK_MARGIN a variable instead of a const. this allows adjusting margin size on system unit init, based on the actual stack length of the executable. useful for small systems running with little stack. allow overwriting SysBackTraceStr with a platform-specific implementation

o patch by Bart B:
* fixes fpc_Val_UInt_Shortstr, part of gitlab 0015633
* fpc_val_qword_shortstr uses the ValueArray constant

Revert " * patch by Rika: SwapEndian([u]int16) has unnecessary “and $FFFF”, resolves gitlab 0039814"

This reverts commit f92102a5f22ae7b978ecf91d59781e16f0b82163.

The and $ffff is needed to avoid range check warnings when the function is inlined with a constant parameter

* Add IsConstValue

* PChar -> PAnsichar

* Rework so scanner & lexer files do not contain actual code. Code is moved to scanbase and h2pbase units

* Add switch to revert to using char

* Dotted filenames for package fcl-sdo

* Dotted filenames for package palmunits

* Add const for string where possible

+ introduced constant MaxIntResource, use it in InternalIsIntResource

h68units: new h68kutil unit, with various constans for now. more to come.

* PS1 system unit: moved constants that should be public to the interface part

+ PS1: add const AllFilesMask to the system unit

* fcl-fpterm/fpmake.pp modified, so it includes a function, similar to
rtl-console/fpmake.pp. This is to allow declaring constant sets for the OSes.

- removed unnecessary (unused) virtual constructors

* Some formatting fixes, make sure string argument is const where possible

Fix variable i range of values in class function TObject.GetInterfaceEntry(const iid : tguid) : pinterfaceentry;

Fix variable i range of values in class function TObject.GetInterfaceEntryByStr(const iidstr : shortstring) : pinterfaceentry;

Fix gitlab 0041380 by shifting left second AnsiChar for SND_ALIAS_XXX constants

* for now, convert only str calls with constant value argument if the string has no encoding enforced

llvm: don't pre-emptively truncate integer constants in typed const conversion

Cast them to an integer type equal in size to the destination type,
rather than to the smallest type that can hold their value

resolves gitlab 0041690

llvm: don't pre-emptively truncate integer constants in typed const conversion

Cast them to an integer type equal in size to the destination type,
rather than to the smallest type that can hold their value

resolves gitlab 0041690

* use {$WRITEABLECONST OFF} when compiling the compiler. This makes it easier to
distinguish between true global consts and "consts" that are actually global
variables.

Change source to avoid changing constant record system_powerpc64_freebsd_info

Change WindowsIsATTY function implementation to fix compilation error in 'true constant mode'

More changes to avoid modifying system_CPU_OS_info constant record for powerpc64 FreeBSD and Linux

Disable writing dwarf debug information for constants inside object or class (as it leads to crashes in GDB)

Fix compilation of optimization debug code