This redesign stores lines in Update and draws stored lines in Draw, instead of previous approach of drawing directly to framebuffer with no cleaning. This approach allows some interesting features like line draw replay or reversing.

* [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