The license.txt file has been replaced with LICENSE for quite a while
now. INAL but it didn't seem accurate to say "hey, checkout license.txt
although there's no such file". Apart from this, there were
inconsistencies in the headers altogether...this change brings
consistency.

* Remove six for PY2 compatability since our dependencies are not, PY2
  is legacy.
* Removed usages of utils from future/past libraries since they are
  deprecated. This includes 'from __future__ ...' and 'from past...'
  statements.
* Removed compatibility imports for PY2, switched from six imports to
  standard library imports.
* Removed utils code blocks that handle operations depending on PY2/3
  versions.
* Removed 'from __future__ ...' lines from templates/code generators
* Used PY3 syntaxes in place of PY2 compatible blocks. eg: metaclass

EXPLAIN EXTENDED is not a valid postgres query, use EXPLAIN instead

Add breadcrumb for backward navigation
Add Table view for SQL Explain
Add __debug__ check for NOOP in production
Remove unnecessary v-bind
Use router.push instead of router-link
Route to request-detail page if route is set to /request/:id

Allow recorder to be started and stopped using bench commands

start: bench --site <site-name> start-recording

stop: bench --site <site-name> stop-recording