* Numerous performance & stability improvements

* The Output block now has an out port which provides the rendered image for further processing
* Some data conversion fixes

* Properties are more dynamic now

* Improved the IE cursors to work better on a black background

* Added an Erode block

* Added a Sharpen block
* The block list now shows a scrollbar if needed
* Fixed vertical resizing issues with the IE control bar

* The Merge Channels block now checks for equal input dimensions

* Layers now have an opacity value

* Added a preliminary Normalize block
* Some cleanup, fixing & refactoring

* Long operations now bring up a progress dialog

* Draft items can now be converted to pixels

* Refactoring

* Fixed a connection issue in projects with multiple labels
* Fixed a crash when duplicating an image build and a property edit is active

* Improvements & cleanup

* ImageBuilds now depend on multiple image references (will be necessary for Overlays etc.)
* More flexible handling of "active images"

* When loading a project, Grinder will now search for missing images in the directory (+ subdirs) where the project file is located

- Added easy image switching
- Finished in-place editors in the Image Editor