Keyboard shortcut legend

New: Show keybaord shortcuts with '?'
New: ctrl+s will save settings
Inital work on relative episode file paths
path and relative path for episode files from API
Fixed casing of drive letter inm tests
Less fail during import
Changed migration numbers (for MediaInfo being added as 056)
Unblanked migrations
Move files via command
Extension won't be null when importing episodes
Ensure that extension is not null