Updated thumbnailator to 0.4.3

From https://github.com/UniversalMediaServer/UniversalMediaServer/commit/acdb5d850a50388433a0c0778533334c2cf5da7f
Added support for m4a files encoded with Fraunhofer AAC

From https://github.com/UniversalMediaServer/UniversalMediaServer/commit/1fc7f756a60080a8997bbc69973595b1bbd7805c and https://github.com/UniversalMediaServer/UniversalMediaServer/commit/524b0ff88e38af01d4dd462ca1c1e712e63e05a9
Upgraded Apache commons-lang to commons-lang3

From https://github.com/UniversalMediaServer/UniversalMediaServer/commit/114059afdb95ddca3a29f8c845931627f8d8c7d4
Enabled better detection of renderers

From https://github.com/UniversalMediaServer/UniversalMediaServer/commit/7687ddbb8d1d6eaa66ee0fb3205873d90d91f3dd
Bump version to 2.6.3
Updated changelog
Official release of 2.6.3 for Windows and Linux
Updated date
Merge branch '2.6.3' of github.com:UniversalMediaServer/UniversalMediaServer into OSX