Started implementing Button.
Merge remote-tracking branch 'origin/master' into button
Merged border changes.
w.i.p
Merged measure/arrange changes from master.
Merge remote-tracking branch 'origin/master' into button
Merged text measure changes from master.
Make BrushConverter accept #color strings.
Made a start to implementing routed events.
Really basic implementation of routed events.

Only mouse move, bubbling working so far. Very hacky.
Properly implemented mouse move events a bit more.
Added MouseEnter, MouseLeave and IsMouseOver.
Merged routed-events branch.
Added missing private modifier.
Basic trigger now working.
Removed debugging code.
Removed debugging code.
Merge remote-tracking branch 'origin/button'
Merge branch 'master' of https://github.com/grokys/Avalonia