Easy Digital Downloads - Software Licensing 3.8.14

Fix: Some information that can be included in the readme.txt files were not being parsed.
Fix: The "Tested Up To" value was not being read properly in the get_version calls.
Fix: The contributors section of the readme.txt files was not being parsed correctly.
Fix: Corrected an issue that caused an `is_countable` notice being thrown on PHP 7.2+.

Fix: Licenses were missing from REST API sales data response when sequential order numbers was enabled.
Fix: License list table was getting 20 per page, but building pagination for 30.
Fix: Corrected an issue with the template for managing licenses causing the 'Back' link to be incorrect.
Fix: A PHP warning was being logged when logging a license renewal email being sent.
Fix: Custom activation count meta could get removed if deleting a license that has activations.
Fix: With URL Checking Disabled, the attempt to get a URL is still run, it should not have been.
Fix: De/activating with no URL parameter was returning success when it should have failed with URL checking required.
Fix: We now support 'staging-` in the local URL detection to support Kinsta staging environments.
Dev: The EDD_SL_DB::insert method wasn't using the type passed into the method.

Fix: Prevent the license query from accepting a user ID or customer ID of 0.