refs #4453
* On by default
* Added config to disable resizing
* Added basic image optimization processing
* Added dep: sharp (optional dep)
* Added resize middleware
* Take care of rotation based on EXIF information
* Removed all meta data from optimised image
* Added handling if sharp could not get installed
* Do not read ext twice - optimisation
* Do not call sharp if config is disabled
* Do not remove the original image which was uploaded (store 2 images)
* Support of `req.files` for internal logic
* Disabled cache to enable file removal on Windows
refs #9178
- `checkFileExists` and `checkFileIsValid` where dirty required from web/middleware
- these two functions are only used in the target middleware
- let's move them
