Local validation of PX4 parameter values

[shakthi-prashanth-m]

When a plugin perform set_param_float_async(), we send mavlink command to set param values. We can save time by locally validating values if we maintain (Min, Max, Default) range for each parameter may be in an XML file (similar to QGroundControl).

    <parameter default="8.0" name="NAV_MIN_FT_HT" type="FLOAT">
      <short_desc>Minimum follow target altitude</short_desc>
      <long_desc>The minimum height in meters relative to home for following a target</long_desc>
      <min>8.0</min>
      <unit>meters</unit>
      <scope>modules/navigator</scope>
    </parameter>

[julianoes]

Good idea! And we already have tinyxml2 included, so we could do this.