[FIX] ExecUtils.async now really runs async
[FIX] ExecUtils.async now really runs async

Before it executed the callable directly if the callers was already in the UI thread.
This leads to a problem if the callers willingly wanted the UI queue to empty first all actions.

bkahlert/com.bkahlert.nebula,bkahlert/com.bkahlert.nebula,bkahlert/com.bkahlert.nebula,bkahlert/com.bkahlert.nebula,bkahlert/com.bkahlert.nebula