Frame dump: Server / client - don't reallocate objects unless
required.
Change the client side to send RGB data reducing the amount of
data OTW with 25% and memory likewise.

Server: Remove flipImage logic, replaced node-png with homebrew
TGA 'encoder', which does not reallocate unless the resolution
changes. This is much faster. In the test-case frame times
dropped from 300-400ms down to <10ms and memory use is now low,
not to mention constant.