PAINTROID-574 Refactored test and functionality from java to kotlin

[Smarshal21]

jira ticket - https://jira.catrob.at/browse/PAINTROID-574
Successfully refactored the following files from java to Kotlin

FillToolIntegrationTest
FlipToolIntegrationTest
CustomViewInteraction
DrawingSurfaceInteraction

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[exland]

Hi,

1. could you please fix the static warnings in Jenkins?
2. these tickets are not ready for development, yet :)

[exland]

Fix the static warnings in the jenkins

[Smarshal21]

Fix the static warnings in the jenkins

Done

wanted to remove the change

[Smarshal21]

which change?

[Smarshal21]

@exland fixed static warnings