configuration management, etc

• support various container formats
• support limiting capture by duration
• support configuration file use (rather than prompt every time)
• various fixes

v0.6.1

vrecord: fixes to usage instructions

V0.6: Added prores to vrecord and fixed typo in codecname for Uncompressed

8-bit.

v0.5

add S-Video back in

v0.4

vstop: wait a bit before killing ffplay

logging and passthrough

v0.3

vrecord: log ffmpeg work as well

vrecord_v0.2

vrecord: more accurate comments

vrecord_v0.1

shotcutsaveas: initial commit