Major Changes
Added typical layer handling functions to the Layers menu.

Fix: Mouse wheel using wrong operation. If a dialog was open and mouse wheel used then the underlying window sometimes executed its mouse wheel operation instead.

Transparent brush color can now be imported as well with the brush color import function (menu Colors/Import Colors from Brush). The transparent color (if any) is marked by some orange bar and placed at the end of all colors to be imported.

Fix: Different problems when importing data from Windows clipboard. Transparency was mixed up and sometimes "Paste Frame" did not work at all.

Prior to NG the Alt key was used as pipette option to replace a color you click on.
Alt is used to replace the color again
Right(!) Ctrl key is now used for picking up opacity (Alt Gr does the same additionally).

Allow isometric angle locks with Shift when drawing straight lines or polygon lines.

Fix: Polygon tools didn't capture mouse movement correctly. When leaving the canvas window the lines where interrupted.

Fix: Brush used wrong size when grabbed with freehand selection.

Fix: Some glitches with color palette selection (e.g. when selecting a palette in project creation window).
- the system searched all files in folder tree. This is now limited to 2 levels
- files that where 768 Bytes in size where incorrectly recognized as color palette

Fix: Error when using gradient color sort function in gradient editor

Fix: Clicking into PM with middle mouse button when coming from another app did a tool operation (e.g. drawing) instead of moving canvas when there is a pinned window.

With menu Edit/Insert Frame global layer palette is not deactivated anymore. Instead the layer palette is used and the frame pixels are remapped to it.

When turning a project into a tile map then it is automatically resized if it does not fit the tile size.

Fix: Import colors from brush reverted the brush the one that was pick up instead of the current one (e.g. imported from clipboard)