2.10

• Fix #539 Fix issue with urls that are double url encoded.
• Fix issue where by some large placeholders aren't rendering behind application load balancers.
• Fix broken images when not logged in - accidently changed with multisite patches.
• #489 Add validation rule to Mosaico uploader.
• #536 Pass in String null so that db field is set to NULL.
• #533 Add type hint to return value.
• #530 Multisite support for search kit templates display.
• #532 Fix tests following #529.
• #410 Multisite support for mosaico.
• #528 Various updates for develop.md.
• #525 Download Mosaico JS files via composer-downloads-plugin.
• #512 Define customTemplatesUrl absolute as templatesUrl.
• #523 Fix crash when installing via CLI.
• #520 Update civix templates.
• #508 Bump postcss from 5.2.18 to 7.0.36.
• #501 Switch newsletter category to one-time insert instead of managed.
• #507 Use CiviCRM core Guzzle dependencies.
• #500 Default orderBy Title on template listing search display.
• #502 Add APIv4 permissions for MosaicoTemplate.
• Switch newsletter category to one-time insert instead of a managed entity.
• Default orderBy Title on template listing search display.
• #496 Don't add the "schedule/send via CiviMail" search task, if the user has insufficient permissions.
• #488 Validate multiple email when testing.
• #490 Loosen restrictions on required fields.
• #493 Ensure that when tests are run search kit is installed.
• #485 Remove crmStar styling, require Bootstrap3.