added CVAR_SAVE and CVAR_NOTIFY flags to cvar_t structure (at the beginning), updated all cvar definitions to match, a lot more cvars are saved now.\nadded server-side portal checking of entity visibility, only entities which really are visible are sent to clients now (some slowdown on server, but reduces network traffic and makes wallhacks useless)\nadded mostly untested mouse and keyboard user interface code (input support not completely finished yet, and no code using the UI yet)\n
git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@953
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