Add setting for suppressing input from mouse, keyboard, or gamepads

[briankendall]

Description

This PR adds three new settings that allow suppressing client input from the mouse, keyboard, and gamepads, one for each type of input. They can be toggled individually, allowing any combination of allowable input the user desires. This also allows for disabling client input entirely, putting Sunshine in a "view only" mode.

All settings are disabled by default, meaning there's no change in default behavior.

This feature was suggested here: https://github.com/LizardByte/Sunshine/discussions/822

Screenshot

Issues Fixed or Closed

N/A

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Notes: code additions are very simple and I consider them sufficiently self explanatory to not require any comments.

I have not added any new methods or components.

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[CLAassistant]

All committers have signed the CLA.

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[ReenigneArcher]

Thank you for this PR! This will be a nice feature to add.

I would like to ask for a small adjustment though.