Make sure there is only 1 runtime active

[ewerybody]

Expected Behavior

Reloading, starting up, anything really should never cause 2 instances of the a2 runtime being live.

Current Behavior

Alsmost savely changing HotStrings causes 2 runtimes to be running.

Possible Solution

The a2 starter script should care about reloads and that a new loaded instance is the only remaining one.