Improve the field check in the page/file picker (see #6125)
Consider all extensions when scanning for `fileTree` fields (see #6058)
Prevent article aliases from using reserved names (see #6066)
Replace `NULL` with `null`
Merge branch 'hotfix/3.1.3' into develop

Conflicts:
	system/docs/CHANGELOG.md
Use the native PDO `prepare()` and `execute()` functions to handle wildcards
Drop the internal DB result cache and use `data_seek()` to navigate the result set
Fix 'Do not exit after a template has been output' (see #5570)
Remove the deprecated `blnCreateNewRecord` reference
Fix the "options callback" - "foreign key" order in the `DC_Table` driver (see #6085)
Consider the additional arguments in `Frontend::jumpToOrReload()` (see #5734)
Fetch multiple UUIDs in a single round trip
Remove the left-over uses of `inactiveModules` (see #6142)
Templates now support adding callables (see #6176)
Add basic authorization support to the `Request` class (see #6062)
Fix two incorrect log messages in `DC_Folder` (see #6202)
Remove the PDO_MySQL driver again (#6182 and #6204)
Add the `data_seek()` method to the MySQL driver
Merge branch 'feature/database-improvements' into develop
Support using closures as DCA callbacks (see #5772)