Better timeseek on resume files

Timeseek was broken with resume files:
-When a resume file was started, it returned 00:00:00 position to
renderer, making very difficult to someone to know what position the
resume seeks to, because renderer thinks it's playing from the beginning
-If someone wants to seek the file, it's necessary to use relative
position, because 00:00:00 in player was the resume position, which is
very annoying
-If someone stops playing the resume file before it ends, UMS will
record the relative position, not the real position in file
VLC Player fixes and optimizations

Some fixes and optimizations in VLC Player.
Moved timeseek logic

Moved timeseek logic to occur before getInputStream(), now it really
does the real thing, not just set the headers.
Cosmetic corrections

Reverting some little past changes that are not necessary anymore.
Fix FFmpeg Thumbnal AR

Fix aspect ratio of thumbnails generated by FFmpeg, just like MPlayer
does (fitting the thumb in a 320x180 rectangle with black padding).
Fix FFmpeg subtitle convert

Added a stopProcess() at the end of FFmpeg subtitle SRT to ASS
converting process. Without this, a pipe is created and a timer keeps
messing up the buffer progress bar, showing 0 MB/XX MB intermittently.
We can see this happening both in GUI interface and trace log when
playing a video with on-the-fly conversion of SRT subtitle to ASS with
FFmpeg.
Update pom.xml with new Dependency link
Merge pull request #293 from Optimusprimeums/pom_update

Update pom.xml with new Dependency link
Merge pull request #291 from tdcosta100/fix-ffmpeg-subtitle-convert

Fix FFmpeg subtitle convert
Merge pull request #290 from tdcosta100/ffmpeg-thumbnail-ar-fix

Fix FFmpeg Thumbnail AR
Merge pull request #280 from tdcosta100/vlc-fixes-optimizations

VLC Player fixes and optimizations
Go back to using MP2 audio in 3.6.x
Updated changelog
Will add this in 4.0.0 instead of 3.6.x
[Build Option] Skip project.binaries download with 'mvn -Doffline'
Allow urls in local playlists + provide fallback item names
Accomodate relative urls in playlists
Additional null check for resume files thumbnail
Merge pull request #306 from tdcosta100/fix-resume-thumbnail

Additional null check for thumbnail of resume files
Additional null check for thumbnail of resume files contd