macosx: fixed appearance issue when collapsing / expanding the playlist while it is empty (close #6382)

macosx: set a sane minimum size for the advanced prefs window, so the options remain useable (close #5994)

Previously, VLC would assume 4/3 picture aspect ratio. That was quite
lame. This patch makes --v4l2-aspect-ratio redundant.

This disables driver-specific modes that VLC would not know about.
This also disables high quality (i.e. still camera) mode since we want
video, as well as other any other future abnormal modes.

Somewhat fixes a big usability problem: tiny buttons, unrevealant icons
and associated text shown as tooltip.
We now reveal all text on mouseover.

We will get more and more of those samples soon...

No sense to display chapter buttons with 1title&1chapter

macosx: prevent a crash by stopping the current input when changing the 'video embedded' variable (close #6063)

Close #6337

The parsing is not complete enough to be on by default.
http-use-IE-proxy option was removed in ac40aef7

Should close/delay #5782

This restores compatibility with 1.1 command lines and docs

Close #6227

Should close #6570

Note: It is not yet passed to the demuxer or the core