[rshapes] `DrawRectangleLines()` lines flickering when zooming out due to `RL_LINES` vs `RL_QUADS` about raylib HOT 3 CLOSED

@raysan5 Would it be an option to have all the pure *Lines drawing methods (expect the *Ex variants) just implemented with RL_LINES, and the *LinesEx methods, which have thickness, be implemented using triangles/quads? I think this would make most sense, since of course lines with thickness can't avoid this issue so we can leave *LinesEx untouched. This way you can just say that the *Lines drawing methods are safe at faraway distances.

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@arceryz Good catch! And thanks for reporting! I expected OpenGL driver to manage that properly on its side... but effectively lines rendering is completely different than triangles... It probably can't be addressed from raylib side but just be properly documented.

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@arceryz DrawRectangleLines() has been reviewed with the proposed fix BUT notice that this change can derive in other unexpected issues: When drawing with GL_LINES first pixel position calculation could be offseted by one pixel depending on the GPU/drivers, I'm afraid it's an impossible issue to be fixed.

Also note that DrawRectangleRoundedLines() now should be reviewed for consistency with other Draw*Lines() functions.

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