Improve filter function

[sondove]

We currently have reserved -f as a filter option for the list views -p,-m,-p -s etc

Ideally we would want the user to be able to specify one or more of the columns to filter on.

My suggestion is as follows

-f column=value for exact
-f column~value for regex match

Requirements

• We should support quotes and meaningful shorthands
• We should be case insensitive
• We should support lowercase version of header columns

Examples

# filter for plot id or name
novem -p -f id=aapl_px
novem -p -f "Plot ID"=aapl_px
novem -p -f name~"apple price chart"

# Filter for email id or name
novem -m -f id=daily_summary
novem -m -f "Mail ID"=daily_summary
novem -m -f name~"daily summary mail"

# Filter for all public plots
novem -p -f shared=P
novem -p -f shared~p

# public and shared with chat
novem -p -f shared~pc

# public or chat
novem -p -f shared~"p|c"