Fixed broken build system in broken webpack version.
Also updates module system to standardise on ES6 import/exports,
Especially since babel has changed it's 'default' logic for the old
module system.
- Added a remove link to remove files that have an error.
- Error will appear below the progress bar.
- Hovering on dz-image or dz-details will display the error message. Otherwise error message was covering the remove link as well.
- Removed styling around the file size.
- Removed gradient effect in accordance with BookStack styling.
- Dropzone filenae will not overflow the container element. Also done for page attachments
- Added a 'uploaded' error message. this error was being thrown when the file size exceeded the server configured file size. (https://stackoverflow.com/a/42934387/903324)
Towards #741
Signed-off-by: Abijeet <abijeetpatro@gmail.com>
