[pvr] fix unnecessary creation of new CPVRChannel instances
[builtin] fix activatewindow if directory path differs

After #5081 the built-in "activatewindow" does not work if you stay for example in the video window and you want to activate the same window with a different path.
This fixes the issue by comparing the directory path of the current active window with the given directory path of activatewindow.
[configure] libflac is not a hard dependency now
[linux] - update docs/README.*
Merge pull request #5527 from stefansaraev/flac

dont require libflac to build kodi core
dxva: fix selection of render target format
[keyboardlayouts] add Turkish
[vfs] Fix reading with zero size and null pointer
[vfs] Fix write with zero size and null pointer
[emu] Better emulate system read()/fread() functions
Merge pull request #5532 from queeup/keyboardlayouts

[keyboardlayouts] add Turkish
[vfs] PosixFile::Write(): remove unneeded cast
Merge pull request #5534 from Karlson2k/fix_vfs_and_emu_01

Better emulate system read() and fread() functions, fixes #15490
[rebrand][darwin/rebrand] - adapt readmes
[rebrand][packaging/seatbeltunlock] - renamed seatbeltunlock to be appnameagnostic, fix the pkg, make it org.xbmc.kodi-seatbeltunlock use @APP_NAME@
[rebrand][packaging/osx/ios/atv2] - move all package scripts to appname
agnostic folders, rename them to be appname agnostic and use @APP_NAME@ -
also add migration step in debian post-inst which will move XBMC data to Kodi if found
[rebrand][atv2] - rename the topshelf icon from XBMC.png to TopShelf.png
[rebrand][darwin] - make use of @APP_NAME@ in our build configurations
[rebrand][osx] - add migration step in preflight (moves the whole XBMC folder to Kodi when found - but only when Kodi folder is not present)
[rebrand][darwin] - use APP_NAME in all xcode build phases