MP1-4574: Allow Windows 10 Preview install, but not supported. Added Server 2012 R2 as reference Server OS for Windows 8.1 and 10
Merge remote-tracking branch 'remotes/MediaPortal-1/MP1-2538-BUG_When_selected_skin_is_incompatible,_no_warning_is_given'
Merge remote-tracking branch 'remotes/MediaPortal-1/MP1-2151-FEAT-Volume_Overlay'
Merge remote-tracking branch 'remotes/MediaPortal-1/MP1-4574-REWORK-Allow_Windows_10_Preview_install_and_add_Server_2012_R2_to_OS_list'
Merge remote-tracking branch 'remotes/MediaPortal-1/MP1-4572-BUG-Revert_MySQL_MyISAM_to_InnoDB_to_avoid_wrong_upgrade'
Merge remote-tracking branch 'remotes/upstream/master' into 1.10.0Fork-BDJ

Conflicts:
	Common-MP-TVE3/OsInfo/OSInfo.cs