Codecs, subtitles and updater

Features added

• You can select the output codec. You can chose x264, x265 or ProRes which are among the most supported codec for NLE.
• You can download subtitles if available. Checking the box will download every subtitles available.
• Check for update when launching the program. If there is a new version available for your platform, proceeds to download and install it.

Changes

• Added the version number
• Modified the layout

Fixes

• Many