Clean up and raw tx type

So MR. MSP430 is short on memory, and pugiXML and making/manipulating
XMLs requires a large library, instead we will use the cut down
bit-banging raw variant I designed today. The server will still be able
to add the readings just fine.

Less information is sent, mostly in the form of flags for status stuff.
Battery levels are not sent until the LOW_BATTERY_FLAG gets set, I
arbitrarily said that was 20%.

Also, I removed all the object files form the server.