[pvr] remove the "All recordings" folder in favor of a "Group Items" option in the side blade
[confluence] adds 'Group Items' button to the PVR sideblade menu
[pvr] adds missing control id constants for sort buttons
[keyboard] adds code for loading keyboard layouts
[keyboard] adds keyboardlayouts.xml
[keyboard] settings for keyboard layouts
[keyboard] changes to GUIDialogKeyboardGeneric for layouts
[gui] bump skin version to 5.3.0, remove backward compatibility code in the keyboard dialog as changes are no longer BW compat. Version 5.0.0 skins will still load, but should be updated to 5.3.0 in preparation for Helix
[confluence] adds support for keyboard layouts to confluence.
Merge pull request #5010 from jmarshallnz/keyboard_layouts

Support international keyboard layouts in the virtual keyboard
Merge pull request #5073 from Jalle19/all-recordings-directory

[pvr] deprecate "All recordings" in favor of a "Group Items" feature
videoplayer: adapt lateness detection and dropping to buffering
video player: present correct pts to user for a/v sync (after buffering in renderer)
videoplayer: some rework and documentation
renderer: bump buffers to 5
videoplayer: update frametime, it might change due to fps detection
videoplayer: give streams with invalid fps a chance for fps detection
dvdplayer: allow rewinding at end of stream, do a seek after rewind
dvdplayer: observe pts counter overflow
dvdplayer: avoid short screen flicker caused by unnecessary reconfigure of renderer