issue68: fix for deleting currrently-playing file does not work.

fixed.  simply moved logic to stop media player (and hide window) to
occur before the actual file deletion.
When browsing files from a Wi-Fi device, newer files are shown at the top.
issue #71: Update wording regarding "Finished Downloads"
issue #66: fix to adjust playback after resuming from pause

removed unnecessary call to set the volume when resuming the player.
this introduced an extra frame step before the actual unpausing occured.
(cherrypick - 39b0a86)FWPlayer: adding display of media filename or file descriptor in player window.

Conflicts:
	gui/com/frostwire/gui/player/MediaSource.java
(cherrypick: d52f864a) fw6-mplayer: adding MediaPlayerAdapter.java
issue #44:Deleting a seeding file.

added additional check in LibraryFilesTableMediator to check if there is
an associated download manager for a particular file targeted to be
deleted and if so, set it's state to stopped.
issue71: fix for mplayer media path length windows problem.

using JNI to make a win32 call to GetShortPathNameW which handles the conversion of a long file name to a short file name.  java side then first converts file name to short version if needed before invoking mplayer executable.
Merge branch '5.5.2' of https://github.com/frostwire/frostwire-desktop into 5.5.2
SystemUtilities Visual Studio project file updates
issue #78: fix so volume slider works without framesteps while paused.
SystemUtils: removing dead and unnecessary code around SystemUtilitiesX64.dll
Fixed bug where a file that was shared and changed in size after it was shared wasn't sending the updated file size in the HTTP headers, causing the receiving end to freak out and think the file is incomplete or larger than expected.
issue #80[mplayer]: fix, volume now set correctly on playback startup
Merge branch '5.5.2' of https://github.com/frostwire/frostwire-desktop into 5.5.2
Updating changelog for 5.5.2
Doesn't ask to send to friend after opening a .torrent file that's been dragged.
moved closing of output stream to finally block, could've ended up open in case of a file transfer error hogging the file resource. added some UI feedback in case of error
changelog update
Merge branch 'master' into 5.5.2