Daqhats

- Fixed MCC 118 scan thread sync issues that could cause occasional hangs
when starting a scan.

- Fixed compile warnings in Raspbian Buster.
- Fixed Python web server examples for compatibility with Dash 1.0.

- Added support for the MCC 134.
- Fixed conflict with libi2c-dev.

- Cleared up some memory allocation errors reported by valgrind.
- Set the value returned by open functions when trying to open the
wrong type of board to RESULT_INVALID_DEVICE (or an appropriate
exception message in Python.)
- Fixed an issue with dash dependency in the MCC 118 web_server Python
example.
- Fixed an issue with segmentation faults when calling mcc118_open() after
changing the locale.

- Fixed an issue with high CPU usage when waiting for a trigger on the
MCC 118 - updated both library and trigger examples.
- Lowered the max SPI clock rate for the MCC 118 to fix communications
issues on some systems.
- Fixed an issue with MCC 152 DIO interrupt callbacks in Python when
running a scan on a separate MCC 118

- Fixed an issue with resource conflicts when using multiple threads in
the same process (such as using multiple MCC 118s.)