New extension: Mouse movement conditions

[D8H]

Describe the extension

Conditions over mouse movement

• Mouse is moving
• Mouse has staid still for a given duration

I think it would make sense to merge the double click extension and this one into a new one.

Checklist

• Extension has a proper name and description.
• Extension has tags (for example: "platform, brick, breakable").
• All behaviors have a description.
• All functions (actions, conditions, expressions) have descriptions.
• I confirm that this extension can be intergrated to this GitHub repository, distributed and MIT licensed.

Extension file

https://www.dropbox.com/s/9v13exvpnovw7b3/MouseMovement.zip?dl=1

It's used by this example: 4ian/GDevelop#2566

[4ian]

Nice! I've renamed everything to be "Cursor" instead of "Mouse", as in the future we might want to put more emphasis on the notion of "Cursor"/"pointer" rather than a mouse (which can be a touch instead).
Thanks!!