Check command version capabilities before use

Avoid attempting to turn on GST (v1.4 required) or PPPNAV (v2.1 required) if the current firmware version does not support those features.

Move to SEMP v2

Migrate to new version of extensible message parser.

Allow older firmware to start successfully

Merge pull request #14 from sparkfun/pcUpdates

Fix for #13

Change HAS specific API calls to PPP generic

v2.0.2

Update version to 2.0.2 in library.properties

Add support for HAS and PPPNAV

v2.0.1

Update library.properties

Make getFirmwareVersion report combined major/minor

getFirmwareVersion() used to report '5' or '6', it now reports '105', '106', or '201' for firmware version 1.5, 1.6, and 2.1.

Add getFirmwareVersionMajor/Minor()

v1.0.10

Update library.properties

Add getFirmwareVersionMajor/Minor()

v1.0.9

Add getFirmwareVersionMajor/Minor

Add maxWaitMs overrides

These are helpful when reading/writing the various UART interfaces.

v1.0.7 - Add accuracy reporting based on GPGST

Merge pull request #9 from sparkfun/pcUpdates

v1.0.7