[PVR] initial support for sub channel numbers. display only. only works with 'using backend channel numbers' enabled
[PVR] bump add-ons
DXVA: factor out interface to dxva decoder into singleton
DXVA: only allow a single dxva decoder to be opened
DXVA: refcount decoder on get/release buffer
[curl] redact effective URL
[pvr] fix destructor visibility to allow polymorphic deletion

This fixes the polymorphic deletion in CGUIWindowPVRBase.
Merge pull request #5290 from opdenkamp/subchannels

PVR: initial support for sub channel numbers
Merge pull request #5338 from xhaggi/pvr-fix-destructor-visibility

[pvr] fix destructor visibility to allow polymorphic deletion
Merge pull request #5335 from FernetMenta/dxva

DXVA: fixes related to ffmpeg
Merge pull request #5337 from wsnipex/curl_real_url

[curl] redact effective URL
fixed: use the proper make instead of calling 'make' directly

fixes builds on freebsd
cmake buildsystem
add tests needed by new u16 string stuff
wrap cmyth properly
move some more install related stuff to install script
move all install code to platform install script
allow building without doxygen
fix building with yajl2
generate scripts in a subdir to avoid problems configuring in top dir