Copy or paste tabulator tables data

[answerquest]

On all the GTFS pages, make it possible to :

• copy out to clipboard the data on tabulator table,
• and paste data from clipboard into the tabulator table.

See: http://tabulator.info/docs/3.5#clipboard

Why this : to make it easy for users to bring in data from excel, or to take it to excel and edit it there then bring it back in. This would enable bulk loading of stops, for example.

Paste: will have to explore if the paste action replaces all existing data, or adds to it, and if this can be controlled.

Concern : tables where not the entire table from backend but just a partial bunch of rows with a common key id (like route_id for trips table) is loaded : have to check if the data pasted is having the same value for the key id column or not. If different, then it needs to be rejected by tabulator.