Implement file notifications (was: Implements new Java 7 functionality)

[Petr Nejedly]

Blocked unless OSX has Java 7

Use OS based file notification instead of the additions/updates thread. Must run the thread on startup to check any new files while the server was off and also get the notifications.

Might implement a queue to have a synchronized single threaded mechanism for discovering new files.

This might make <<issue 375>> obsolete.

Looks like the Java7 service won't work on all remote Filesystems. Might have to use something else. http://forum.serviio.org/viewtopic.php?f=3&t=5340#p38164

[Petr Nejedly]

Related ticket: #740, #582, #229, #790

[Petr Nejedly]

needs to support

• initial scan after start (only if automatic scan is enabled)
• delta monitoring (queue) (only if automatic scan is enabled)
• library update after upgrade
• force refresh should probably run the initial scan
• should not wake NAS devices from sleep