[WIP] axes... not styled at all
[WIP][Broken] More work on gridlines... almost working
Finished Gridlines and Scales

- Finished work on drawing scales and gridlines.
Style tweaks from peer review
Merge pull request #94 from QutBioacoustics/axes

feat(editor) Support for gridlines and axis scales, Closes #28

Closes #28

Other features like buttons to turn grid/scale on/off and save those settings in the user profile are new issues.