Rave glove demo: Network rave data

Sending glove modes over the network, and fixed ghost-fingers-left-behind issue.
Issues addressed:
  https://basecamp.com/2151194/projects/2058851-avatar/todos/54607028-bug-phantom-leap
  https://basecamp.com/2151194/projects/2058851-avatar/todos/54633674-demo-make

NOTE: This has not yet been tested machine-to-machine. There's an assert in the decode method in HandData.cpp intended to catch any network packet mismatch errors.