Update hashfuncs, add some missing math funcs.

[Faless]

Including hashfuncs (or any hash_* template) was broken and causing build error due to missing functions.

In file included from /media/SSD/Code/git/godot-cpp-dev/include/godot_cpp/templates/hash_map.hpp:36,
                 from src/tests.h:35,
                 from src/register_types.cpp:40:
/media/SSD/Code/git/godot-cpp-dev/include/godot_cpp/templates/hashfuncs.hpp: In static member function 'static uint32_t godot::HashMapHasherDefault::hash(const godot::Vector4i&)':
/media/SSD/Code/git/godot-cpp-dev/include/godot_cpp/templates/hashfuncs.hpp:211:16: error: 'hash_murmur3_one_32' was not declared in this scope; did you mean 'hash_djb2_one_32'?
  211 |   uint32_t h = hash_murmur3_one_32(p_vec.x);
      |                ^~~~~~~~~~~~~~~~~~~
      |                hash_djb2_one_32
/media/SSD/Code/git/godot-cpp-dev/include/godot_cpp/templates/hashfuncs.hpp:215:10: error: 'hash_fmix32' was not declared in this scope
  215 |   return hash_fmix32(h);
      |          ^~~~~~~~~~~
/media/SSD/Code/git/godot-cpp-dev/include/godot_cpp/templates/hashfuncs.hpp: In static member function 'static uint32_t godot::HashMapHasherDefault::hash(const godot::Vector4&)':
/media/SSD/Code/git/godot-cpp-dev/include/godot_cpp/templates/hashfuncs.hpp:228:16: error: 'hash_murmur3_one_real' was not declared in this scope
  228 |   uint32_t h = hash_murmur3_one_real(p_vec.x);
      |                ^~~~~~~~~~~~~~~~~~~~~
/media/SSD/Code/git/godot-cpp-dev/include/godot_cpp/templates/hashfuncs.hpp:232:10: error: 'hash_fmix32' was not declared in this scope
  232 |   return hash_fmix32(h);
      |          ^~~~~~~~~~~
scons: *** [src/register_types.os] Error 1

This PR re-synchronize the hashfuncs with upstream godot, adds some missing math funcstions, and includes all godot_cpp/templates/* headers in the test project (so we ensure they can at least be built).

Note: We should probably re-synchronize the other templates too since I believe they are outdated but I'd rather do that in a separate PR.

[Faless]

I'm not sure why the CMake MSVC build is failing, the SCons one seems to pass. Any CMake guru that can help?

[akien-mga]

No idea how to fix the MSVC issue but given that it's failing with a syntax error in gen/include/godot_cpp/variant/utility_functions.hpp which seems to include most of the stuff found in math_funcs.hpp, I suspect it might be unhappy about the is_nan / is_inf additions. This kind of MSVC syntax error typically happens when a symbol has been overridden or isn't defined.

[akien-mga]

If someone is motivated, I made #834 to get verbose output from the CMake builds to be able to compare the build flags used by SCons and by MSVC, both using VS 2019.

CMake:

C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.29.30133\bin\HostX64\x64\CL.exe /c /I"D:\a\godot-cpp\godot-cpp\include" /I"D:\a\godot-cpp\godot-cpp\gen\include" /Zi /nologo /W3 /WX /diagnostics:column /O2 /Ob0 /D _MBCS /D WIN32 /D _WINDOWS /D DEBUG_ENABLED /D DEBUG_METHODS_ENABLED /D TYPED_METHOD_BIND /D WIN32_LEAN_AND_MEAN /D _CRT_SECURE_NO_WARNINGS /D "CMAKE_INTDIR=\"Debug\"" /Gm- /EHsc /MD /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /GR /std:c++17 /Fo"godot-cpp.dir\Debug\\" /Fd"D:\a\godot-cpp\godot-cpp\bin\godot-cpp.windows.release.64.pdb" /external:W0 /Gd /TP /wd4244 /wd4305 /wd4101 /wd4018 /wd4267 /wd4099 /errorReport:queue  /external:I "D:/a/godot-cpp/godot-cpp/godot-headers" [ ... ]

SCons:

cl /Fogen\src\classes\sprite_base3d.windows.debug.x86_64.obj /c gen\src\classes\sprite_base3d.cpp /TP /std:c++17 /nologo /Z7 /Od /EHsc /D_DEBUG /MDd /DTYPED_METHOD_BIND /DDEBUG_ENABLED /DDEBUG_METHODS_ENABLED /Igodot-headers /Iinclude /Igen\include

Maybe one of those triggers the error.

Either way, to unblock this I would suggest either trying to remove the is_nan/is_inf definitions, or disable the CMake build on CI temporarily.

[Faless]

My bet is on /DWIN32_LEAN_AND_MEAN. EDIT: seems like I lost my bet :-p