Add "--show-param2" option and more precision to the CRF logging.

This is based on komisar's cosmetic patch.
Some people don't like it to show most of settings while encoding.
New experimental AQ mode (modification of Auto-variance AQ)
lto & Ofast
Print video info with lavf/ffms demuxer
AviSynth 16bit hack
Skip bit depth filter when possible
Use f3kdb for bit depth conversion when needed

This fixes high bit depth AviSynth input with input-depth != 16 or BIT_DEPTH
Detect color matrix with lavf/ffms demuxer
Fix AviSynth color space converting matrix
Fix swscale color space converting matrix
Support "dgi" file extension
Support "vpy" file extension
Support invoking LSMASHSource in avs demuxer
Variable progress precision, print encoded file size & estimated total size

This patch may cause progress indicator to exceed console width limit.
Try to increase width of console window to avoid the problem.
don't show opencl help in opencl disabled builds
version: print whether opencl is disabled or enabled
don't print useless info from libav