Sync custom controls with built-in controls in leanback overlay

[nielsvanvelzen]

So we have an unmaintained library that implements like 60% of the player user interface, but on top of that we have a bunch of hacky code. Simply said, the player UI has a bottom-region with the buttons etc. which is implemented by leanback and a top-region that is implemented by us.

Whenever the controls are shown or hidden these would never be in sync, sometimes the title would randomly appear during seeking etc. This is super annoying and especially with the "ask to skip" media segment action it was just painful.

So I synced them. and probably introduced new bugs

Changes

• Show "topPanel" by default, just like the leanback overlay
• Hide/show "topPanel" when leanback overlay is shown/hidden
• Added checks to "topPanel" to not show when already shown or hide when already hidden, this caused the animations to replay which looked weird and stupid
• Increased headache by 40%

Issues