Support null for FactMetaData default

Shorten meta data keys for smaller file sizes

Fix deprecated usage

Support parameter meta data coming from COMPONENT_INFORMATION as well as old system

Add typeToString method

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Add custom validator support

Add support for Json file string translations

Change decimal futzing to bias towards specifically set decimal places value

Add support for DEFINE replacement in FactMetaData enumString/Value json loading

Added support for qgcRebootRequired Fact meta data value.

It was broken when temperature translation was added in babbfbd1
The system wasn't quite setup to handle anything other than speed and distance. Changed so any arbitrary unit type can be converted to another.

It was broken when temperature translation was added in babbfbd1
The system wasn't quite setup to handle anything other than speed and distance. Changed so any arbitrary unit type can be converted to another.

Move  MAV_PARAM_TYPE to  MAV_PARAM_EXT_TYPE as we're now using the proper MAVLink version.

It did not like the use of the tr() macro within a static QString in the constructor.