dvdplayer: fix setting playspeed on startup
Merge pull request #5308 from FernetMenta/player

dvdplayer fix setting playspeed on startup
[confluence] add audio/video flags

Added: hevc and vp9 video flags
Added: opus audio flag

refreshed webm logo hence the vp8 change.
Merge pull request #5313 from uNiversaI/icons2

[confluence] add audio/video flags
[omxplayer] Merge in latest dvdplayer changes
[dvdplayer] Make players pointers rather than objects
[dvdplayer] Create a base class for audio and video players
[omxplayer] Rework trickplay to reduce changes to dvdplayer
[dvdplayer] Support omxplayer as a variant of dvdplayer
[players] Mark the render features as deprectated and add an OMX prefix
[players] Remove no longer used visualisation callback mechanism
[players] Allow choice of omxplayer through acceleration settings
[players] Remove omxplayer as separately selectable player