Qt: minor grammar and orthography fixes

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
Disable macosx avfoundation capture plugin on iOS

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
macosx: fix contribute link in about dialog
macosx: fix potential link in open panel
Revert "macosx: fix contribute link in about dialog"

This reverts commit 73a4a5a2963c64240d7073a472e53d571ff4c91a.
hotkeys: Bookmark subtitle timestamp only if it exists and is enabled.

In ACTIONID_SUBSYNC_MARKSUB, do not bookmark subtitle timestamp if
there is no subtitle, or if subtitle has been currently disabled.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
Hotkeys: strings simplifications
Qt: menu: reorder open media options
Qt: menu, remove navigation part
Qt: change tools accessor
Use the proper type when reordering channels
macosx: expand Subtitles menu for on-the-fly changes of text size, text color, background color, background opacity and outline thickness
freetype: allow on-the-fly changes of relative font size, background opacity, background color, outline thickness and text color
freetype: fixed compilation on Linux
Revert "freetype: allow on-the-fly changes of relative font size..."

This reverts commit 92ed368467d3a3e734f8cd9fda2c884c84e03b47.
This reverts commit 79b43ecd0d30b46501437b3a5f6132a2e4c3bf93.
This breaks thread containment of the text renderer.
macosx: add missing l10n to the subtitles menu
NEWS: add Subtitles menu to OSX section
macosx: fix 'toggle-sidebar' menu state (close #8213)
NEWS: nitpicking
macosx: subscribe to libvlccore's debug messages only if the messages panel is actually displayed

This solves the empty console issue for builds running with debug messages enabled