Modify settings default for buffer latency to 20ms, with display to match
Hide and show the drawpoint at the right time, fixes #66
Add option for opening last image at startup
Utilize resetUndoStack to avoid unnecessary confirmation dialogs
Fixes #65
Move paint and canvas into central scale container, Fixes #58
Also manages exact point check position to match (checked via overlay)
Catch up to latest robopaint branch for method-draw
Add context switch/close trigger for sub-apps to handle themselves
Allows for (and in this commit implements) contextual close/switch warning dialogs with cancel options
Fixes #39