Search widget polish

Fix small typo in api doc

Fix link on TagEditorHelp

When saving Card with source Card use its read perms

Fix some formatting in the SQL parameters guide

This wraps some uses of `{{}}` which was rendering ``` entities directly in the document with `{% raw %}` opening and closing tags.

It also adds a line break that was missing, causing the new paragraph to be rendered as part of the previous bullet point.

Fixing #6984: Updating mysql/mysql-connector-java to version 5.1.45

Fix unescaped quotes in clj i18n strings

FieldLiterals on date fields should parse as dates [ci drivers]

Specifically this occurred when filtering on a field from a nested
query. The date string wasn't getting parsed as a date and just
getting passed as a string to the database causing a type mismatch.

Fixes #6988

Query cancellation

This commit adds query cancelling to the generic sql driver, Druid and
Presto. It cancels the future the query is running in which will
interrupt the query and allow any query cancellation logic to run. If
the database doesn't support query cancellation, or the necessary
information (i.e. query id) isn't available, the code will behave as
it did before.

Switch sql templates to an instaparse grammar [ci drivers]