## Summary / How this PR fixes the problem?
Fix Artboard and multiselection hitbox detection
* Artboards now have different effective for selection or for item creation.
* Selection hitbox is now used for translation, which enhances artboard.
* Artboard now draws label. This can probably be improved by scaling the
final pixmap rather than the font size...which results in nasty
hinting.
* In general, virtual methods were added to drawables to allow for
static items (items that change size with different scales.
Although they should probably be used sparringly.
## Steps to Test
Use artboards!