PAINTROID-768: Add Spray Can tool

[Lenkomotive]

PAINTROID-768

New Features and Enhancements

• Implementation of spray tool + a radius slider where the radius of the spray tool can be altered.
• Unit testing
• Integration testing
• extending integration test methods

Checklist

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[celebi-liebrecht-haas]

The tool seems to create centerly densed points. It can probably we evened out with adjustions to point calculation logic.