Delete SITL's --param feature, which is broken anyway

[hunt0r]

Summary

Delete SITL's --param (aka -P) feature, which is broken anyway.

Testing (more check increases chance of being merged)

• Checked by a human programmer
• Tested in SITL
• Tested on hardware
• Logs attached
• Logs available on request
• Autotest included

Supplying --param or -P to a SITL command fails & prints usage, as expected:

~/ardupilot/ArduCopter$ ../build/sitl/bin/arducopter --param FOO=BAR
Options:
	--help|-h                display this help information
	--wipe|-w                wipe eeprom
  <...>

This confirms the expected change, as before this PR it responds:

Unknown parameter FOO

Context

This resolves issue #6114 .
It is the replacement for PR #32158 .

[peterbarker]

LGTM

[peterbarker]

Merged, thanks!