Re: Introducing --gc:arc

[Araq]

Also, out of my todo we accompished so far:

[ ] Optimize the stdlib with sink and lent annotations.  
[x]Optimize init+sink pairs into plain copyMem calls.  
[ ] Optimize away wasMoved+destructor pairs.  
[ ] Port async to --gc:arc.  
[x] Exceptions are known to be buggy, will probably be replaced by a mechanism 
based on the "quirky exceptions" ideas.  
[x] Bugfixing. Omg, still so many bugs left...