Add DC::alphaPattern
Add UI panel for changing lighting constants
Texture viewer: Use the background colour and exposure properties
Maximise the main window by default
Add Essence::Graphics::Object accessors and rendering control infrastructure.
Make up/down arrow keys behave the same as mouse wheel when viewing models.
Add TabControl::removeAllTabs
Fix ScrollingContainer to work when the containee overwrites m_position.(right|bottom)
Tab Control: Allow getting/setting the active tab via its caption

As part of this, "title" is renamed to "caption".
Add ScrollableWindow::getContainer
Add a TreeControl variant which has a tickbox on every item.
Add UI panel for controlling object visibility