* Remove PLATFORM_RPI

* remove build artifacts

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Co-authored-by: MichaelFiber <michael@cubeofb.org>
Co-authored-by: Ray <raysan5@gmail.com>

Moved outside BeginDrawing()/EndDrawing() to illustrate drawing is happening to an external texture (not screen)

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

Contributed by ProfJski