GUIDrop initial release

WIth GUIDrop it's possible to add images directly to Mudlet by Drag&Drop.
The code will be created automatically.
It uses Adjustable Container with some extras.
Once found the position you want the image in it can be converted to a normal Geyser.Label and use all the perks of them.

This is a very early version,
if you find issues or have some ideas how to improve GUIDrop
please leave feedback in the issue tab.