Reintegrate testScreenshotUpdate
Merge pull request #740 from Catrobat/ReintegrateTestScreenshotUpdate

Reintegrate testScreenshotUpdate
Refactor testIfBrickParts
Merge pull request #745 from Catrobat/RefactorIfBrickTest

Refactor testIfBrickParts
string highlighting after user selection.
Merge branch 'master' into DatatypeStringExperimental