1. Fixed thread-crash at terminate() time by terminating the LeapManager properly
2. Fixed an intermittent thread-crash when Leap active by removing auto-connection between controller and listener
3. Added fingerRoot positions to display and data packet
4. Introduced a vec3-based convention so that more finger data may be added without causing trouble for old clients and servers
5. My avatar's fingers are different color from others
- Simplified finger updates and storage
- added pack and unpack for the fingers
- not yet tested between multiple machines, but *should* be harmless and backward-packet-compatible
- Added Hand.cpp, Hand.h, HandData.cpp, HandData.h, roughly matching the equivalent Head files
- Cleaned up Avatar by moving hand work into Hand files
- Added fixed-point data packing, for use in sending hand offsets
