* [examples] Added: `shapes_rlgl_triangle` example

* correct name

* formatting

* Revert "formatting"

This reverts commit f1d246a648.

* Revert "correct name"

This reverts commit 974985ed49.

* Revert "[examples] Added: `shapes_rlgl_triangle` example"

This reverts commit d053b9afa0.

* [examples] Added: `shapes_rlgl_color_wheel` example

* clarify color variable

* formatting

* formatting

* formatting

* formatting

* reduce redundancy

* moved color updating code to update

When SDL_GameControllerNameForIndex returns null, the app crashes. This was addressed earlier in PR#4859 though the fix submitted on PR #4859 was only fixing the crashing and not addressing the root cause.

- Fix IsGamepadAvailable() returns false for an available controller immediately after window initialization

Elements tested:
```
TESTING_FAIL_INIT      = 1 << 0,   // Initialization (InitWindow())    -> "INFO: DISPLAY: Device initialized successfully"
            TESTING_FAIL_CLOSE     = 1 << 1,   // Closing (CloseWindow())          -> "INFO: Window closed successfully"
            TESTING_FAIL_ASSETS    = 1 << 2,   // Assets loading (WARNING: FILE:)  -> "WARNING: FILEIO:"
            TESTING_FAIL_RLGL      = 1 << 3,   // OpenGL-wrapped initialization    -> "INFO: RLGL: Default OpenGL state initialized successfully"
            TESTING_FAIL_PLATFORM  = 1 << 4,   // Platform initialization          -> "INFO: PLATFORM: DESKTOP (GLFW - Win32): Initialized successfully"
            TESTING_FAIL_FONT      = 1 << 5,   // Font default initialization      -> "INFO: FONT: Default font loaded successfully (224 glyphs)"
            TESTING_FAIL_TIMER     = 1 << 6,   // Timer initialization             -> "INFO: TIMER: Target time per frame: 16.667 milliseconds"
```

* Example textures_screen_buffer

* remove resource preload for web makefile

* update description

* code formatting

* [examples] Added: `shapes_rlgl_triangle` example

* correct name

* formatting

As the license for previous bunny was not clear, it was replaced by a new custom bunny specifically created for this example with a CC0 license

* Added models directional billboard example

* add killbot texture

* various fixes and formatting tweaks

* corrected stdlib

* Added sprite stacking example

* added link

* formatting