Added VGUI sidebar skeleton.
Initial progress on volume controls.
Sidebar now appears while holding down C
Move subfolders of the content folder to the root addon folder
Added some basic HTMLMaterial styles.
Volume slider bar is now painted.
Volume slider can now be changed by scrolling the mousewheel.
Removed extra knob from the volume control
Added tab panels.
Fixed error when grabbing the path string from a resource URL.
Progress on the playback UI component.
Queue header is now visible in the sidebar
Added queue list
Adding UI events for communicating updates to the sidebar menu.
Volume slider now updates volume cvar.
Fixed issues with EventEmitter.
Sidebar now listens for media changes.
* Various minor UI changes.
* Fixed up the alignment of the playback panel.
* Added queue changed media player event.
* Added queue data for testing the UI.
* Initial progress on hooking up the media player queue.
Media queue now uses actual data; also fixed some alignment issues.