Number of fixes, including:
* Fix to creation and saving of services
* SongBeamer encoding detection
* OSX plugin, media and presentation controller discovery and import fixes
* Make the ftw thread work in its own thread, rather than the main thread


lp:~phill-ridout/openlp/fixes-V (revision 2801)
https://ci.openlp.io/job/Branch-01-Pull/2351/                          [WAITING]
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https://ci.openlp.io/job/Branch-02-Functional-Tests/2252/              [WAITING]
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