...pointer instead of window pointer.

This pulls the initial EGL surface dimensions as parameters two level
up the call stack. So far, it makes no functional difference as the
values will be 1x1. This requires a nonfunctional adjustment to other
modules though.

vlc_gl_Create() is never #define'd.
Its first parameter is not a generic VLC object.

Use C functions instead of an ObjC singleton for string operations and move all string related operators to a single header/implementation

This is little more than a stub and will serve as a base for the window displaying the new library

The opaque value is for the mouse_event callback.

It does the same as CommonControl().

Re-use an existing string instead of creating a new one and hide the path action item if there is no action to perform

macosx/coreinteraction: split apple remote, media key and video filter handling as those don't belong there

No functional changes

Asking NSFileManager for the mounted devices can take very long (>6s) when the devices are slow to respond, so let's do that on the background thread and don't delay display of the open panel.

libplacebo won't find it

Asynchronous requests from the user interface should still be queued
without blocking, even if the video output is held by other processing.

For that, we need to release the mutex between Hold() and Release().