Simplify extension handling

Closes GH-5
Implement subtitles
Cleanup logging
Code cleanup
Use Sqlite WAL mode and prevent cover overwrites
GUI: Show message on crash
Remove Company from About
HTML: Add cover name
Add Homepage menu item
Improve logging behavior
Implement MediaInfo.sec header
Improve StemNameBase
Set Sqlite chunk size
Switch to MSVC 2013
GUI: Save descriptor in dedicated file.
Add dimension view
Bump version to 0.15