Move palette to left panel.

Don't look at this commit for too long or your eyes will
begin to bleed.
Ensure that 'Add Color' button does not scroll when scrolling palette colors
Highlight currently selected color in palette

My first use of multiple cursors being passed to a component. Seems
to work great!
Prefer #() to (fn [e]) construction
Remove unneeded text field in palette entries
Don't add redundant entires to palette. Just select them if they already exist.
Add colors to palette if necessary when using eyedropper tool
Bump version to 0.0.7a
Update preview image
Merge branch 'NewHomeForThePalette'