Webinar support

• Added missing lang string for cache.
• Updated activity chooser help text.
• Added support for webinars.
• Fixing Unicode issues.

Version 1.3

• Fixed join before host option.
• Added Zoom user reports.
• Added connection status checking on settings page.

Version 1.2

Fixed issue: Have email lookup be site configurable #3 (See https://github.com/ucla/moodle-mod_zoom/issues/3)

v1.1

• Issue #1: allow underscores in API key and secret.
• Issue #2: Fix language strings to not use concatenation.
• Added support for "group members only".

v1.0

Initial release