Log fixes

Allow the use of auth and credentials in opentsdb

why else would it be defined?
and this is sane anyway.

Add secureJsonData field to appSettings model

set cookie could potentialll leak information about the
datasource if in proxy mode.

closes #3845

New dropdown menu to surface the snapshot feature, basic styling in p…

add default value for fill policy

Add support for playlist based on tags

Standardized on fa-link icon for Link instead of external-link, which generally means Open In New Window or Go Offsite

New icon font

test(playlist): add test for playlist sqlstoretest(playlist): add test for playlist sqlstoretest(playlist): add test for playlist sqlstoretest(playlist): add test for playlist sqlstoretest(playlist): add test for playlist sqlstoretest(playlist): add test for playlist sqlstoretest(playlist): add test for playlist sqlstoretest(playlist): add test for playlist sqlstoretest(playlist): add test for playlist sqlstore

No added trailing slash if proxypath is empty in JoinUrlFragments

The JoinUrlFragments function adds a trailing slash if to the proxy url
if the proxy path is an empty string. This fix removes that trailing
slash. Fixes #3847