bump codemirror to v3.1

Makefile changes: copy additional Codemirror resources
HTML css, and code changes: support updated Codemirror in pages

Also: add more margin on right of Code Editor to make scrolling
easier on both the left and the right
fix link to modelJSON on Model Editor

[#45818397]
support extended inquiry datalogging in NetLogo

IS [#44826447]

fixed
- accumulation of old timeseries data in subsequent runs

VISUAL:

Added v21 of Bob's AirBags model

added support for
- representational-inputs
- custom inquiry-summary data
IS: support Codemirror display of exported data