Grayed out elements in Options, Audio properties and other miscellaneous functions

[flandriai]

After opening the Options menu:

• on the Player tab the complete "Title bar" panel is grayed out, and most parts of "Other" and "History" panels.
• Formats tab completely empty on Windows.
• Playback tab: There is a "Speed step" option, but there is no way to change playback speed of the audio track. It would be great to have the same option like in MPC-HC or in SMPlayer: + / - 10% speed step with the option of using high pitched sound too. (Pitch correction is already added.) As for the video track: fast forward is already possible with the seek bar and the function is working perfectly.
• Miscellaneous panel grayed out.
• Ability to hide "Playlist" panel by default is missing.
• Playlist repeat forever function is excellent and working great. Playlist options should be extended with the ability of deleting playlist history on exit and with the ability of setting whether to add "All items" in a folder or only "Audio" or "Video" files.
• The ability of repeating the current file forever is missing.

However the Frame step function works already much better comparing to any other players, as:

• there's no sound (video automatically muted) when using frame step both forwards and backwards
• and the frame step function works smoothly, without any glich. Whether you step forward or backward the function operates excellently.

[cmdrkotori]

Yeah half the stuff in the settings window isn't implemented, but you see I never use those features myself so it'll get done when it gets done.

[cmdrkotori]

As of a recent-ish commit in git master, all/most of these are now hidden: the user will no longer know what they're missing. :^)