AE: add S24NEMSB and treat S24NE4 with bit in lower 3 bytes
AE: Explain the conversion between SNE24NE and SNE24NEMSB
AE: remove convert function from ActiveAESink
ActiveAE: remove convert functions from input stream
AE: drop obsolete AEConvert class
AE: drop unneeded format AE_FMT_S8
AE: drop obsolete class AERemap
AESinkPULSE: Clean all BigEndian and LittleEndion Formats
WASAPI: fix audio formats
update VS project after removal of AEConvert and AERemap
XCode: Remove AEConvert and AERemap
Merge pull request #4819 from FernetMenta/s24

AE: fixes and cleanup
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