GPS Schematics

- [x] Double check ON/OFF should be connected directly to WAKEUP, perhaps we can just tie WAKEUP on and switch ON/OFF ourselves
- [x] ON/OFF line is not actually connected to that label (needs a junction or draw a horizontal line from the label to intersect the existing wire)
- [x] Check I2C resistors are as-per datasheet, as typically pullups and not series resistors are used (but this might be OK)
- [x] Should TM_GPIO5 be connected to something? It just has a bit of wire at the moment
- [x] Add no-connects (press q or use the X button on the right) to non-connected pins
- [x] Rename labels to reflect the pin's name. Since the name is mostly for the purpose of connecting on the microcontroller, it is more helpful if it's named "GPS_SDA" rather than "Connect to microcontroller I2C SDA"
- [x] I2C labels should be SDA and SCL for conformity with I2C standard
- [x] Only need one of I2C, SPI or Serial to interface to the microcontroller, and probably serial is easiest
- [x] Antenna needs adding, see M2R schematic for example
- [x] Add 100nF capacitor to power pins