Benewake, LeddarOne, LightWareSerial, MAVLink, MaxsonarI2CXL, MaxsonarSerialLV, NMEA, PX4_PWM, uLanding and Wasp already stored the last read time so for these drivers, this change just moves that storage to the state structure
analog, BBB_PRU, Bebop, LightWareI2C, PulsedLightLRF, TeraRangerI2C, VL53L0X did not store the last read time so this was added
This commit changes the way libraries headers are included in source files:
- If the header is in the same directory the source belongs to, so the
notation '#include ""' is used with the path relative to the directory
containing the source.
- If the header is outside the directory containing the source, then we use
the notation '#include <>' with the path relative to libraries folder.
Some of the advantages of such approach:
- Only one search path for libraries headers.
- OSs like Windows may have a better lookup time.
the backends are setup to have just the minimum functionality needed
for a rangefinder, with all of the higher level logic in the
frontend. This should make writing a new backend easier