Removed logic related to aspect ratio from the components.
When the main bbox changes, if the scale method is auto, the reducers will handle the scaled bbox size appropriately.
Somehow linking up the manual mode to the aspect ratio is tricky, and instead of adding complexity for a rarely-used mode, I'm leaving manual mode as fully manual.
- Support grid size of 8 on canvas
- Internal canvas math works on 8
- Update gridlines rendering to show 64 spaced lines and 32/16/8 when zoomed in
- Bbox manipulation defaults to grid of 64 - hold shift to get grid of 8
Besides being something we support internally, supporting 8 on canvas avoids a lot of hacky logic needed to work well with aspect ratios.
Canvas and non-canvas have separate width and height and need their own separate aspect ratios. In order to not duplicate a lot of aspect ratio logic, the components relating to image size have been modularized.
