- Add `services.kanshi.profiles.<name>.outputs.*.alias` to support new
alias directive from kanshi [1].
- Add an assertion to reject aliases not on global scope, which are
not allowed on kanshi [2].
- Add a new test to check alias rejection, `alias-assertion`.
- Add relevant coverage by modifying the existing "new-configuration"
test.
- Kanshi also doesn't allow wildcards on global scope [3], correct the
faulty test case.
[1]: 1ed86ce523
[2]: 1605f7c813/item/doc/kanshi.5.scd (L78)
[3]: 1605f7c813/item/doc/kanshi.5.scd (L80)
