DM-4574: Table (JS): text view

[loitly]

Added text view. Also, added the ability to save the table.

[robyww]

The code all looks fine. First pull request that I don't have anything to say about any line of code!

I am getting an exception:

TableStore:

    onUnmount() {
        const {tbl_id} = this.tableModel;   //<---- here, line 26
        this.handleAction(TblCntlr.TABLE_REMOVE, {tbl_id});
    }

The exception happens when I show the table in the tri-view and try to switch to another view, such as side-by-side.