PAINTROID-445 Give feedback of changed canvas when changing tools

[Electronix1337]

Rewrote some parts of switchTool structure in order to highlight(set the color border to orange) the box (of BaseToolWithRectangleShape) for 300 milliseconds before actually switching the tool.

https://jira.catrob.at/browse/PAINTROID-445

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[FromG]

on jenkins 2 additional testcases fail when testing with catroid.
However as i could not reproduce them locally i do not know if it is a ticket depending error.

lgtm.

[CodeChamp-SS]

What do you think about this approach? This would help in utilizing the already implemented highlight functionality and avoiding use of runBlocking :)

[CodeChamp-SS]

LGTM! The changes work as expected.