Fixed confusion over script (runtime perms) answer handling.
Fixed confusion over script (runtime perms) answer handling.

- client.OnScriptAnswer was not cleared if a new avatar was targeted for
perms check.
- the test for existing was comparing an LLCV to an SP (IClientAPI) for
equality.
- the second problem may have resulted in trying to add the same
OnScriptAnswer and OnConnectionClosed handlers repeatedly, every time a
runtime permissions prompt was issued.

kf6kjg/halcyon,M-O-S-E-S/halcyon,InWorldz/halcyon,kf6kjg/halcyon,emperorstarfinder/halcyon,kf6kjg/halcyon,InWorldz/halcyon,zwagoth/halcyon,InWorldz/halcyon,M-O-S-E-S/halcyon,InWorldz/halcyon,zwagoth/halcyon,emperorstarfinder/halcyon,M-O-S-E-S/halcyon,M-O-S-E-S/halcyon,zwagoth/halcyon,M-O-S-E-S/halcyon,M-O-S-E-S/halcyon,M-O-S-E-S/halcyon,M-O-S-E-S/halcyon,zwagoth/halcyon,kf6kjg/halcyon,kf6kjg/halcyon,zwagoth/halcyon,emperorstarfinder/halcyon,emperorstarfinder/halcyon,zwagoth/halcyon,InWorldz/halcyon,zwagoth/halcyon,InWorldz/halcyon,kf6kjg/halcyon,kf6kjg/halcyon,kf6kjg/halcyon,emperorstarfinder/halcyon,emperorstarfinder/halcyon,kf6kjg/halcyon,InWorldz/halcyon,M-O-S-E-S/halcyon,InWorldz/halcyon,zwagoth/halcyon,emperorstarfinder/halcyon,zwagoth/halcyon,InWorldz/halcyon