brightcove 8.x-2.0

Added support for PHP 7.3 and included various other fixes:

• Require brightcove/api 2.1
• Issue #2879387 by yce, fgm: Module is missing core search integration
• Issue #3002898 Replace state with lock for semaphore
• Issue #2837795 Merged in drupalorg/ticket (pull request #1)
• Issue #2837795 Fix comment
• Issue #2837795 Removed assignments in `if` for player related changes
• Issue #2837795 Update player related implementation
• Issue #3018142 by muldos: Webprofiler made module crash on report dashboard
• Issue #3015601 by akoe, yce: Missing config schema
• Issue #2875507 by oknate: Hoping someone can tell me how to use a template for brightcove
• Issue #2914790 by cman9090, nilesh.addweb: Error: Call to a member function delete() on null
• Issue #2928280 by saranya ashokkumar: Creating brightcove_custom_field with...
• Issue #3004209 by LeventeLantos, saurabh-chugh: Apply new {project}:{module}...
• Issue #3078706 by LeventeLantos: php 7.3 regex issue
• Issue #3078679 by LeventeLantos: php-api-wrapper compatibility fix
• Issue #2952220 by fgm: Convert commands to Drush 9
• Issue #2959502 by Cecilina, yce: Prefix custom fields on the video edit form.
• Issue #2988014 Fix entity links definition.
• Make sure that the queue is empty if an api client is deleted.