[sldev] 1.20 release notes (rough draft)

[Kelly Linden]

>> * DEV-7746 SVC-1072: Havok 4 -- Objects can exist up to 4096 meters
>> up, but scripted rez above 1024 meters fails silently
>
> That's not a viewer fix. Is the corresponding viewer fix in there?
>
The problem with releasing rough pre-release notes.  You are correct.  
What is in this viewer is the viewer-side component of increasing the 
max build height to 4096.  Internally that work was tracked in DEV-7746.

 - Kelly