Extraterm v0.15.0

• Fix for a bug which hung the app when moving a frame into its own tab.
• Command palette is now more discoverable and works somewhat as a replacement for the RMB context menu.
• When the command palette has no filter, then it groups the entries more like a context menu.
• show command now supports showing multiple files.
• show command can show data from stdin / pipes. It also automatically detects the type of the data using similar techniques to the unix find command.
• show command gained explicit charset, filename and mimetype parameters for use when showing data from stdin.
• from command also accepts multiple frame IDs.
• from command also gained xargs style functionality where multiple frames can be fetched, put into temp files and then run a command on them. (for example, use diff on the contents of two frames.)
• Dependencies have cleaned up.

Don't forget to grab the new commands.zip too.