v0.99.4-beta

Fixed bugs with PCM-1600 SI stitching, improved video standard detection for STC-007, improved START-marker detection for STC-007, updated FFMPEG version, re-written FFMPEG wrapper with more multithreading and preliminary capture device support, added support for Unicode in output filenames, added VU-meters, added source total frame counter, updated internal frame counter from 16-bit (max 65535 frames) to 32-bit (max 4294967295 frames), fixed window position saving, general GUI fixes.