Function Addition
Added an option to the eyedropper tool to also eyedropper while dragging.
Added mouse wheel smoothing option to Preferences.
Added mouse wheel sensitivity setting option to Preferences.
Added an option in Preferences to automatically save a PNG thumbnail when saving an MDP file.
Function Improvement
The preferences dialog has been made tabbed for improved usability.
Failure Correction
Fixed a bug in thumbnail display of layer properties.