* Replace GTA_SWITCH macro with __SWITCH__ for platform specific stuff and GTA_HANDHELD for the rest (which could be used by other ports)
* Use GAMEPAD_MENU on GTA_HANDHELD, which will replace the usual controller setup (which contains some useless features for handhelds)
* Fix some identation inconsistencies
* Disable PC_PLAYER_CONTROLS on GTA_HANDHELD builds
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