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

We use @CMAKE_INSTALL_PREFIX@ in the pkg-config template, but the way we
use it breaks when used with a path containing a space. Use quote to fix
this. This now means, we probably can't have quotes, but that's of
lesser concern.

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

Not required anymore

Reason for removal: This function forces a specific Image data format, it copies data internally (it could be confusing and lead to memory leaks), it's redundant, there is a simpler alternative and raylib promotes using structures directly

It seems some internals change recently due to web security reasons and some emscripten HTML5 funtionalities like pointerLock or fullscreen modes behave very weird or just don't work as expected

* Chromium needs a larger audio buffer: https://github.com/dr-soft/miniaudio/issues/150

* changed PLATFORM_WEB to __EMSCRIPTEN__

See #1304

Some internal defines have been exposed in config.h

* Implemented DrawTextureTiled()

* Example added