Provides a way for users to actually delte their user drafts where
required.
For #3927
Added test to cover new endpoint.
Makes update to MD editor #setText so that new selection is within new
range, otherwise it errors and fails operation.
- Updated UI with image form dropdown containing delete and replace
image actions.
- Adds new endpoint and service/repo handling for replacing existing
image.
- Includes tests to cover.
- Fixes existing broken attachment edit tabs.
- Redesigns area to move away from old tabbed interface.
- Integrates new dropzone system, for both addition and edit.
- Added file placeholder for non-image uploads.
- Added use of upload limits.
- Removed upload timeout variable.
- Added pass-through and usage of filetypes.
- Extracted some view text to language files and made use of existing
text.
