Added a basic Video Player.
Changed fetching FPS from the movie.

* GUI tries to automatically get FPS for newly opened files
* Added an option to get FPS from current movie instead of selecting one.
On FPS change, change frame or time value according to FrameTime origin.
Release 1.0.1
Added jumping to the start of highlighted sub

Remember that MPlayer (and most other video players) can seek only to video keyframes, so jumping
isn't THAT accurate. That's why seeking values were decreased - to enable user rewinding video a
little bit and playing it frame by frame if he must.
Added a "shortcut" for Aspect ratio menu entry.
Changed forward/rewind shortucts to ctrl+right, ctrl+left
Highlight the whole row in case of error.

This is to disable clearing user selection but leave a visible error.
Added inserting and removing subtitles.
RemoveSubtitles command inserts back only removed subtitles on undo()
Added 3 new signals to DataModel

New signals are: subtitlesAdded, subtitlesRemoved and subtitlesChanged. As arguments they have a
list of numbers of affected subtitles.
Added SubApplication::cleanup()

It's interface requirement which was forgotten before.
Select next available row on subtitle remove
"Save as..." opens a file to which subs are saved.
Changed "movie" strings to "video"
Updated Polish translation.
Added some icons.
Updated wiki web address.
Added missing window icon.
Fixed displaying timestamp for some kind of movies

For some kind of movies MPlayer doesn't show frame number on its info line. That's why we have to
fetch both: frame and timestamp and fallback to less accurate timestamp when frame is not available
(let's say that we ignore frame when it's equal to 0).

This resolves issue #58