[Sdl] add keycode, keymod and scancode constants #827
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This PR adds following SDL enums as Haxe constants:
The
KeyCode
andKeymod
constants source code is generated from a C program using code lines like this one:which ensures that numerical values in the Haxe source are actual C macro values.
The
Scancode
source is generated by simple find/replace operation, since all enums in SDL source have literal numerical values.