Add optional parameter to [ForcedOptions] to make changes optional

[11EJDE11]

Currently with maps you can force options with:

[ForcedOptions]
chkNoSpy=true
chkShortGame=false
chkBalancePatch=true
...etc

Doing this will force the checkboxes to the value provided (true=ticked, false=unticked) and lock the checkbox (checkBox.AllowChecking = False).

This PR adds an optional second parameter that sets the value for checkbox.AllowChecking

So essentially it allows maps to force options, but still allows hosts to change them.

[ForcedOptions]
chkNoSpy=true,false
chkShortGame=false
chkBalancePatch=true,true
...etc

[11EJDE11]

Also it was user "786" on Discord that requested something like this in ra2yr-updates-chat about a week ago.

[github-actions]

Nightly build for this pull request:

• artifacts-TS.zip
• artifacts-YR.zip
• artifacts-Ares.zip
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[SadPencil]

Besides a coding style issue, others are fine