add in major UI wrappers

[chadvandy]

GLab.UI system

port in a lot of the core goodies

• better UI-click system, GLab.UI.OnClick() or GLab.UI.NewTextButton:OnClick()
• port in lots of oft-used types that can be implemented anywhere - text input, buttons, checkboxes, lists, etc.
• pull most of MCT's core UI shits out

[chadvandy]

click commands:

• table in GLab.UI, for TrackedComponents
• k = address, v = uicomponent
• grab address through context.component, test TrackedComponents
• if match, test uicomponent:Address() - returns nil if it's a dead interface!