[CSUMB-224] Beginnings of the image chunk type.
[CSUMB-224] Merge branch 'devel' into 224-image-chunk-type
[CSUMB-224] Add chunk type settings hook so that chunk types can be configured per field instance. Add entity and entity_type variables to chunk theme implementation. Remove image chunk type as it will be added back in as a submodule.
[CSUMB-224] Add image chunk type. At this point it is mostly functional, but still needs some cleanup work.
[CSUMB-224] Add empty check for image chunk type.
[CSUMB-224] Do not pass configuration for the current chunk to every chunk configuration form loaded. That is silly.
[CSUMB-224] Add alt and title default values to the config form so they persist.
[CSUMB-224] Force the last chunk in the widget to have a staged view, regardless of what is in input.
[CSUMB-224] Add type_settings to top-level variables in chunk theme implementation. Use type_settings to correctly handle the default_image setting on the image chunk type.
[CSUMB-224] Add note about client-side extension validation.
[CSUMB-224] Get rid of references to the description_field setting provided by the file module since we do not use it. Provide some sane default descriptions.
[CSUMB-224] Pass default configuration instead of an empty array if we do not have any configuration set when building a chunk form.
[CSUMB-224] [CSUMB-224] Remove isset() checks on configuration variables since it is now safe to assume that at least the defaults exist.
[CSUMB-224] Remove preview_image_style from chunk type settings since we have our own chunky preview functionality.
[CSUMB-224] Hide unnecessary form elements instead of removing them so we do not get notices from the external forms we depend on.
[CSUMB-224] Add title for the image upload widget both because it is required by file_managed_file_save_upload() and because it is helpful.
[CSUMB-224] Improve documentation for chunks_image module.
[CSUMB-224] Migrate heading chunk type to a submodule and add notes to the text chunk type implementation so we remember to delete it when it is no longer necessary.
[CSUMB-224] Fix error in documentation.
[CSUMB-224] Hide the cancel button if you remove an image from a chunk.