Added UI changes for renaming cl_screen.c->SCR_AdjustFrom640() to SCR_ScaleCoords().
Syntax cleanup in some client particle code.
Simplified Zaero visor HUD scaling hack with strncmp().
Renamed "cursor" cursor_t struct to "ui_menucursor".
Renamed "currentweaponmodel" char pointer to "ui_currentweaponmodel".
Added shutdown functions for console, screen, and UI.