Crossfire: Map error checking for stacked monsters
The check has been implemented. It is included in the Crossfire editor variant.
[crossfire] Add Duplicate Monster map validator
Do not crash if the system clipboard is unavailable during a copy operation in the messages window
Update the system clipboard only when the user selected some text with the mouse in the messages window
Remove unused import statements
Fix tooltips in Spells dialog: show the correct spell level
Improve package-info files