Improve game server Steamworks error handing
* "Unable to load Steam support library" should now tell you why
* dedicated server workshop support now does some more failure checks
Use new Steamworks API Init func on client that tells us what's wrong
Rip out the HL2/Portal demo stuff
* It was called some client Steamworks APIs on the game server, and just screw all that in general
Fixed instances of SRCDS trying to use clientside Steamworks APIs
* Fixes [SAPI FAIL] messages
Disable MMX and 3DNow code
* MMX was never used but still reported support, 3DNow is obsolete for 10+ years now
* 3DNow was also only ever implemented on 32bit Windows builds
* Removes r_sse2 concommand as well, no reason to allow disabling it really
* Adds enable_fast_math from CS:GO (enabled by default)
Splish splash some colors from x86-64 VPC to main
* Easier to see what projects changed now