Merge pull request #3513 from bolt/release/5.2.0-rc.1

Release 5.2.0-RC.1

Merge pull request #3507 from bolt/release/5.2.0-beta.26

Release 5.2.0-beta.26

Merge branch '5.1'

Merge pull request #3477 from bolt/feature/relations-options-limit

Allow setting a limit for the options displayed in relationships selects

Merge pull request #3490 from bolt/release-5.2.0-beta.24

Prep release 5.2.0-beta.24

Smarter saving of Taxonomies, less redundant

Merge branch 'master' of github.com:bolt/core

Update Content.php

Merge pull request #3467 from bolt/bobdenotter-patch-1

Update ContentEditController.php

Merge pull request #3460 from bolt/fix/uppercase-extensions-thumbs

Allow thumbnails for files with uppercase EXTENSIONS.