Version 2.2 beta 3, now with MyPaint brushes

The third beta of the 2.2 series is now out. This one includes a special last minute addition courtesy of Askmeaboutloom: support for MyPaint brushes!

Changes in this release include:

• MyPaint brushes
• MyPaint style 15 bit color channels. This fixes the color artifact issues that have plaged previous versions.
• Removed popup notifications for join and leave events
• Fixed skew when scaling a selection from the top-right handle
• Fixed mouse droppings when for large brush outline widths
• Fixed laser trail persistence selection
• Split color wheel, sliders and palette into separate docks
• Fixed "no guest logins" checkbox eanbled state
• Fixed session snapshot missing the timeline
• Timeline editor is now disabled when missing timeline edit permission
• Timeline editor now shows the selected layer
• Layer forward/backward shortcuts now also autoselects the corresponding layer