biojs-vis-sequence: Give back control of user selection.
biojs-vis-sequence: Give back control of user selection.

- Allow users to select text themselves.
- Track what user has selected, but do not apply custom highlighting.

Signed-off-by: Anurag Priyam <6e6ab5ea9cb59fe7c35d2a1fc74443577eb60635@gmail.com>

deepakunni3/sequenceserver,yeban/sequenceserver,vivekiitkgp/sequenceserver,vivekiitkgp/sequenceserver,yeban/sequenceserver,aldermossy/sequenceserver,vivekiitkgp/sequenceserver,jasminZ/sequenceserver,aldermossy/sequenceserver,aldermossy/sequenceserver,aldermossy/sequenceserver,yeban/sequenceserver,deepakunni3/sequenceserver,jasminZ/sequenceserver,lepbase/lepbase-sequenceserver,elsiklab/sequenceserver,yeban/sequenceserver,IsmailM/sequenceserver,jasminZ/sequenceserver,IsmailM/sequenceserver,lepbase/lepbase-sequenceserver,deepakunni3/sequenceserver,elsiklab/sequenceserver,lepbase/lepbase-sequenceserver,elsiklab/sequenceserver,IsmailM/sequenceserver