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 cl_http_fallback cvar to disable Q2Pro path and UDP fallback for HTTP downloads.
Added check to prevent game library from sending unicasts to non-present clients (i.e. bots).
Updated Lazarus version number.
Updated Qudos' Unix makefile for source file changes. Compiling for Linux still needs more fixes, such as static libs (libcurl/zlib/png/jpeg/ogg/vorbisfile).
Added UDP fallback from HTTP downloads and support for Q2Pro-style HTTP URLs.
Now allows downloading non-numerical pak files via flagging certain paks as protected.
Misc filesystem changes.
