Add Advanced Features from Buzzard Classic

[NPoole]

• Adds "Advanced" Checkbox which reveals advanced options pane
• Adds Inline Formatting from Buzzard Classic
• Adds Overlining using KiCad syntax and overline style selection
• Adds UI buttons for commonly used symbols

[NPoole]

Yes, here's a screenshot of the new UI. I'm also working on a PR right behind this one to add tool-tips.

With the "Advanced" box unchecked, the UI remains unchanged:

Checking the box reveals new options as follows:

[NPoole]

Closing this PR to detangle the branch