Overhauled slider menu control to show cvar value and simplify implementation.
Changed RGB color increment for railtrail in effects options menu from 16 to 4.
Changed default values for cl_railgreen and cl_railblue to be multiples of 4 to match increment of menu sliders.
Moved misc utility functions in ui_subsystem.c to ui_utils.c.
Added dynamic updating of Anisotropic filtering.
Added Cvar_IsModified() function.
Refactored screen and HUD scaling functions.
Added text size to string drawing functions.
Added textSize field to menu items for submenu headers.
Fixed compiling on MSVC6.