* Make currentTiddler variable consistent in subfilters and filter run prefixes
* Updated filterun prefix and subfilter operators to use ..currentTiddler instead of outerCurrentTiddler
* Merge
* Clean up
* More clean up
* Ensure image import works when type is not set, clean up post import actions
* Removed spurious new line
* For non image files insert a tiddler link
* Added documentation for new settings and features
* Update releasenotes 5.1.24
This includes changes up to 06-05-2021
* Incorporated feedback into release notes 5.1.24
Incorporated feedback and moved the '[[ActionPopupWidget]] to create floating popups that must be manually cleared' under widget improvements.
* Add :sort filter run prefix, docs and tests. Also extended .utils.makeCompareFunction with a flag for caseSensitivity.
* Documentation updates
* Move case sensitivity handling entirely to utils method so it is reusable
* Make filter run prefixes extensible
* Make filter run prefixes extensible
* Support rich suffixes for filter runs
* merged conflicts
* Pass suffixes to filterrunprefix
* add dynamic toolbar buttons + HowTo
* remove some whitespace.
* move howto and improve shortcut logic
* move howto
* add whitespace so it can be removed in an other PR.
* Extend dropzone widget with optional actions invoked after tm-import-tiddlers message has been sent. Allows triggering an alternative UX for the import
* Allow restricting a dropzone to specific mimeTypes via mimeTypes and mimeTypesPrefix attributes
* Use a mimeTypesFilter instead of the mimeTypes and mimeTypesPrefix attributes
* Updated refresh handling
* Syntax cleanup
* Replace references to mimeType with content type for consistency with existing documentation. Update documentation for DropZone widget
* double quotes are no longer escaped in html bodies
* changed tiddlyweb's html-div-tiddler; documentation
French version still needs a translation though
* Replace css-escape-polyfill.js with escapecss.js utility module
* Add $tw.utils.escapeCSS() method and invoke that function within the
escapecss operator.
* Add test cases for the "escapecss" filter operator
* Fix $tw.boot.doesTaskMatchPlatform() so it works as expected if
a module's export.platforms contains more than one values
* Add missed files to the last commit
