Also do not save garbage, especially pointers, in the plugin cache.

This hinders the following commits. This was only used in a single
plugin on a single platform, and was poorly designed.

Until config_GetPszChoices() learns to load modules when needed, any
module with a list callback must be loaded at all times.

The code previously assumed that plugins with list callbacks also had
action callbacks. This is not true.

macosx: dynamically create context and main sub menu for playlist table header selection, Simplifications in existing code

Regression from d70cda88.

The layout of struct addrinfo is variable (notably because of RFC5014),
so copying hints is brittle.

Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

For consistency with 691e604c, libass doesn't need harfbuzz on Android. (It doesn't build anyway.)
Signed-off-by: Rafaël Carré <funman@videolan.org>

Pointed-out-by: Michał Trzebiatowski <hippie_1968@hotmail.com>

Qt ensures event IDs are never reused by providing a way to register
them dynamically. We have code that allocate event IDs statically and we
need to check/register those then to ensure proper offset for dynamic
ones. (we could just register them too, but this wouldn't allow
switch/case through values)