added lua function for GetTimeSinceStart

Allows checking time within a single update. This can be used to halt
processes which would otherwise cause lag.
Update UPX to 3.91
Move PCRE to separate project (2011)
Move PNG to separate project (2011)
HNS_Missed

Added an HNS type to handle holds which are never initialized due to
missed taps. This fixes a long standing issue with
iCurPossibleDancePoints and allows themes to decide how to handled this
case.
Move GLEW to separate project (2011)

Note: glext.h was removed due to it not being used.
Move LUA to separate project (2011)
Merge pull request #70 from sigatrev/RageTimer

added lua function for GetTimeSinceStart
Merge pull request #94 from sigatrev/MissedHold

HNS_Missed
Merge pull request #91 from root670/master

Update UPX to 3.91
Merge pull request #95 from wolfman2000/wolf-libraries

Separate out VS2012 projects appropriately.