* Promoted INIT_STRUCT from ev_macros.h to global status as edefstructvar in z_zone.h 
* Introduced new KEYD_JOYxx constants for buttons 1 through 16. Gamepad buttons generate keydown and keyup events using these virtual key codes again.
* Refactored keybindings to set their key names in a loop instead of one by one, using a keyname_t array.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2416 86ba831e-150c-0410-ab35-e06eaae15ed9