Sys_GetEvent()
* renamed res_none to no_more_events, because that's what the
caller assumes when getting that event
* don't return res_none on unhandled events, instead get the next event
until there is a handled event or no more events
(=> if -> while, return res_none -> continue)
* Mapping to Doom3 keynum handled differently for SDL1 vs SDL2, see below
For SDL2 we don't use SDL_KeyToDoom3Key on the keysym anymore, but map
the SDL2 scancode to Doom3/Direct-Input scancodes instead (the keynum_t
K_* constants are really used as scancodes!).
This mapping is done in sdl2_scancode_mappings.h scancodeToKeyNum[].
In sdl_events.cpp there are static SDLScanCodeToKeyNum() and
KeyNumToSDLScanCode() functions that use this scancodeToKeyNum[] array.
Sys_GetKeyName() now does something sensible for SDL2 by using
KeyNumToSDLScanCode()
This is also used to implement idKeyInput::LocalizedKeyName() for SDL-targets
(for SDL1.2 the behavior doesn't change much, though, as it doesn't have
consistent scancodes - Sys_GetKeyName() will just return NULL and
idKeyInput::LocalizedKeyName() will fall back to the old default)
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