Remove cropWindow, integrate into dimensionWindow
Change variables to match private-field code-style
Simplify option-descriptions
Enable custom-dimension
Order of dimension-options
Move file-field and dimension field into separate container
Styling of form-field and dimension-field in backend
Change dimension-field from trigger-field to text with button
Remove fieldset for custom size (simplify design)
Fix problem with resize out of window
Style crop to look like photoshop
Fix problem with resize out of window south and east
Add title for regions
Use preview-config with cover=false to let small images stay small
Add cutoff for filename if to long
Styling input custom width/height
Add constraint to prevent user from resize out of image

Tried to remove check if pos < 0 or pos + size of cropregion > size of image
but it is still possible to resize about 3px out of the window and
I didn't found how to solve this bug by now so the old check is still needed
Handle situation when image to small.

If image to small window keeps min-size. If image bigger than min-size
window becomes bigger.
Set correct title to match button
Center crop image if smaller than window