Feature Request - Right click selected entity/trigger to modify it's properties before placing

[MikosDrafle]

As the title says, an option should be added to Loenn which works as follows:

1. The user selects the entity from the Placement tab.
2. The user right clicks onto an empty field in the editor space.
3. The property window for the selected item shows up, and can be freely modified.
4. Placing the entity will inherit those modified properties.