Update version tag to v2.4.1

Make standard fields optional, grouping configurable

Rename extra fields GUI tab to fields
Add ability to include fields without affecting grouping
Add flags --show-fields, --group-fields which default to
"Footprint,Value"
--extra-fields is now a shortcut to show and group additional
fields (along with standard Footprint, Value)

Fixes openscopeproject#167

Update dataformat and readme docs

Add board stats, checkbox progress bars

Fixes openscopeproject#77

Update readme

Update readme

Fix th borders disappearing in ff and edge

Update readme for v1

Implement reverse lookup on click

Notes: only works when corresponding bom row is not filtered out.
When there is ambiguity on click, subsequent clicks will cycle through
possible interpretations.

Fixes openscopeproject#9

Update readme