Fixed incorrect conflict highlight colour.
Misc CSS tweaks.

Added bottom margin to lists, added styling for standard tables.
Moved typography CSS into separate file.

Since all files are concatenated, this is really just an organisation
thing.
Use icons, not icon buttons, in readme.
Move base background colour CSS.

The main panel is the only place it can be seen anyway.
Fixed accidental summary table styling.
Display bar under default selected tab in editor.
Use a darker accent colour on light backgrounds.

For non-bold text.
Updated readme changelog.
Get plugin dummy status from its header.

Until its full content is read. Closes #369.
Minor changelog update.