CATROID-1078 Add new CLTs for the set transparency brick

[reichli]

https://jira.catrob.at/browse/CATROID-1078

A new CLT was created to ensure proper test coverage of this brick. After the transparency of an object has been set it can be queried and checked via the transparency-property to make sure that it has been set correctly. Edge cases (what happens if the transparency goes beyond 100%/below 0%) have also been tested.

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[adnaribo]

Looks good.

[wslany]

Please add test cases (in the same testSetTransparency.catrobat test suite) to check whether the transparency is actually changing on the screen. This can be done using the color sensors, and also the touch sensors, as well as the Tap bricks. There are several ways to do this.

Please also add a test case (in the same testSetTransparency.catrobat test suite) that checks whether the brick is slowing down loops as expected (see https://jira.catrob.at/browse/CATROID-760 for details).

[wslany]

Please remember that the CLTs should be able to serve as a specification by example for future implementations and for Catty (which does not yet have a physics engine).

[UlrichLa]

Looks good!

requested changes are resolved, PR can be merged