Add *32 and *64 build directories to gitignore.
Add more search directories for cmake modules

I actually did this because it makes it a bit easier to use with a
build from cross-compiled windows FFMpeg/x264 DLLs.  When compiling on
linux I just have it compile to a custom prefix directory for the
specific windows arch, then I just copy the arch dir back to my windows
HD when complete.  Adding this to the cmake allows me to use the compile
arch directories directly without modification.
win-dshow: Add debug macros for logging timestamps
win-dshow:  Change FFmpeg MPGA decoder

Apparently MPGA is equivalent to MP2, not MP1.
win-dshow: Update libdshowcapture to 0.3.3

Adds full support for the HD-PVR Rocket