Tickless video output thread

The video output thread should not poll. The main reason for polling is the blitting hack known as bug #541. Another reason is the existence of the plugin "manage" callback.

added Component::Core: Video output Severity::normal Type::bug Version::master git + 1 deleted label

changed milestone to %Bugs paradize

manage is getting deprecated now but the following video output are still broken: AA, CACA, EVAS, KVA, SDL, D3D11, D3D9, DDraw, GLWin32 and WinGDI.

Cursor hiding is another potential problem, see #18661 (closed).

Manage callback is gone. #541 is the only blocker left.

mentioned in issue #18661 (closed)

marked this issue as related to #541

mentioned in issue #26184