Add various CLI features to manage display groups

[waydabber]

Currently the groups feature is fully uncontrollable via CLI. This should change.

[waydabber]

Initially the following should be possible:

• list groups
• enable groups
• disable groups

Also, maybe:

• high level configuration group activation policy
• enable/disable synchronization for a group
• enable/disable layout protection for a group
• enable/disable ui scale matching for a group

And then if there is demand (future):

• group creation, cloning and removal
• detailed configuration of activation policy and membership
• full synchronization configuration
• full layout protection configuration
• full UI scale matching configuration

[waydabber]

Related to #4315

[waydabber]

List display groups and its identifiers:

betterdisplaycli get -type=displaygroup -identifiers

Get a group's tag ID from name:

betterdisplaycli get -n=DisplayGroupName -identifier=tagID

Get a group's name from tagID

betterdisplaycli get -tagID=XX -identifier=name

Enable, disable, toggle and get enabled status of a group:

betterdisplaycli set -n=DisplayGroupName -enabled=on
betterdisplaycli set -n=DisplayGroupName -enabled=off
betterdisplaycli toggle -n=DisplayGroupName -enabled
betterdisplaycli get -n=DisplayGroupName -enabled

Get group activation state:

betterdisplaycli get -n=DisplayGroupName -active

Set/get group activation policy:

betterdisplaycli set -n=DisplayGroupName -activationPolicy=allMembersPresent
betterdisplaycli set -n=DisplayGroupName -activationPolicy=anyMembersPresent
betterdisplaycli set -n=DisplayGroupName -activationPolicy=anyTwoMembersPresent
betterdisplaycli set -n=DisplayGroupName -activationPolicy=anySyncSourceWithTargetMembersPresent
betterdisplaycli get -n=DisplayGroupName -activationPolicy

Set/get/toggle synchronization, layout protection, UI scale matching (examples):

betterdisplaycli set -n=DisplayGroupName -synchronization=on
betterdisplaycli set -n=DisplayGroupName -layoutProtection=off
betterdisplaycli toggle -n=DisplayGroupName -uiScaleMatching
betterdisplaycli get -n=DisplayGroupName -uiScaleMatching