[omxplayer] Use macros to reduce diffs with dvdplayer
[omxplayer] Use names closer to dvdplayer
[omxplayer] GetAbsoluteClock like dvdplayer
[omxplayer] Cosmetic: Copy formatting from dvdplayer
[omxplayer] Update master clock changes from dvdplayer
[omxplayer] Update to dvdrefactor
[players] Move Step implementation into PlayerVideo
[players] Make methods protected
[players] Remove unused functions
[players] constify functions
[players] Add plumbing for missing methods for consistency
Merge pull request #5161 from popcornmix/dvdrefactor_pre

[players] Make omxplayer be derived from dvdplayer, part 1