Create core Leo JS files using Transcrypt

[edreamleo]

The ekr-tests branch now contains the work. See PR #27.

Run Transcrypt (with -a -b -m -n option), inserting pragmas as needed, on at least these files:

• [x] leoGlobals.py
• [x] leoNodes.py
• [x] leoFind.py (includes cff commands)
• [x] leoUndo.py
• [ ] leoCommands.py (for iterators). Maybe: create a new file just for c.iterators.

See also Leo issue #1788.

[edreamleo]

This issue is now moot. The leojs project will use bespoke ts files.