Multicursor Redux

[riotrah]

I'm opening this new issue to make this more focused redux of #610 / #1606 manageable. This time, we're rolling things out piecemeal behind an opt-in "feature flag".

The older issue/PR should stay up as they have a lot of great info and context I'll need as I tackle these.

Order of implementation of the various paredit command groups:

The criteria to determine order is primarily a combination of perceived/remembered ease of implementation, level of disruption and importance/impact/value.

This order is subject to change as I re-familiarize myself with the paredit code.

• testing and diagnostic utils (eg textNotationFromDoc etc) Paredit Multicursor - Prep - Should expose new calva commands for creating vscode Docs from textNotations and vice versa #2418
• movement Paredit Multicursor - Implement movement #2420
• selection Paredit Multicursor - Implement selection #2421
  • grow/shrink selection Paredit Multicursor - Implement selection #2421
  • selectCurrentForm Paredit Multicursor - SelectCurrentForm #2476
• wrapping
• rewrapping
• slurp/barf
• raise
• splice (unwrap)
• drag
• swap/transpose
• split/join
• kill/delete
• semicolon