rlBlendMode() has been added to rlgl to be used on BLEND_CUSTOM. This functionality is exposed to advance users.

In any case, new blending modes could be added if required.

Co-authored-by: max <max.cedercreutz@cetopo.com>

Co-authored-by: codifies <nospam@antispam.com>

When using USE_PTHREADS=1 on libraylib.bc compilation, program requires --shared-memory passed to the linker and despite it compiles, it fails on execution (at least for me).

Review raylib resource file for DLL compilation

It can be useful in some cases qhen compiling for multiple architectures

This function was renamed for consistency in raylib 3.0, just unified all examples to use TextFormat() instead of FormatText()

When .fnt file is in the .exe path, image path was wrongly calculated

24bit per sample is not supported internally and automatically converted 16bit

There are no *.lib files that could overwrite each other when building
both static and shared versions of raylib at once. So just use the
normal library name without _static suffix.

When you install emsdk out of the box, the directory is no longer `$(EMSDK_PATH)/python/33.7.4_64bit` but rather `$(EMSDK_PATH)/python/3.7.4-pywin32_64bit` noting the `3.7.4-pywin32_64bit` change on the last file.

Thus, without adjusting this in the raylib Makefile it will throw an error:

```
PS C:\raylib\raylib\src> make PLATFORM=PLATFORM_WEB -B                                                                  emcc -c core.c -Wall -D_DEFAULT_SOURCE -Wno-missing-braces -Werror=pointer-arith -fno-strict-aliasing -std=gnu99 -Os -s USE_GLFW=3 -I. -Iexternal/glfw/include -Iexternal/glfw/deps/mingw -DPLATFORM_WEB -DGRAPHICS_API_OPENGL_ES2              '"python"' is not recognized as an internal or external command,                                                        operable program or batch file.  
```

However, changing this line in the Makefile compiles raylib for web as expected

`"raylib library generated (libraylib.bc)!"`

* rlglCheckErrors

* rlglCheckErrors LOG_WARNING

* rename to rlCheckErrors; improve messages; revert core.c

* MeshSmoothNormals() by average

* wrong comment

* spelling

* use correct function naming convention