Added change engine mic state and mode on caster startup for DNS

[LexiconCode]

Description

Added setting change engine mic state and mode on caster startup defined in settings.toml

Outside of changing modes on startup switching modes set_mic_mode and set_engine_mode will not be fully implemented until exclusivity is added for all engines.

# Speech recognition engine settings
        # Speech recognition engine settings
        "engine": {
            "default_engine_mode": False, 
            "engine_mode": "normal",
            "default_mic": False, 
            "mic_mode": "on"
        },

Valid "mic_mode" settings.

	'on': mic is on # default
	'sleeping': mic from the sleeping and can be woken up by command
	'off': mic off and cannot be turned back on by voice. (DNS Only)

Valid "engine_mode" settings.

    'normal': dictation and command (Default: DNS only)
    'dictation': Dictation only 
    'command': Commands only (Default: Other engines)
    'numbers': Numbers only
    'spell': Spelling only

Related Issue

Relevant to implementing sleep/modes for other engines #797

Motivation and Context

This gives the user control over their startup experience with both the engine mode and mic. This is implemented for DNS only at the moment but in a separate PR due to the scope of testing and implementation for using grammar exclusivity.

How Has This Been Tested

This is been tested with DNS

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue or bug)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Renamed existing command phrases (we discourage this without a strong rationale).

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• I have checked that my code does not duplicate functionality elsewhere in Caster.
• I have checked for and utilized existing command phrases from within Caster (delete if not applicable).
• My code implements all the features I wish to merge in this pull request.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests pass.

Maintainer/Reviewer Checklist

• Basic functionality has been tested and works as claimed.
• New documentation is clear and complete.
• Code is clear and readable.

[LexiconCode]

I have a little bit of work to do with the logic in set_engine_mode.

Feel free to suggest improvements.

[LexiconCode]

Okay this should work as expected now and I've simplified logic.