Add 13 alias tests (clearing 6 sytests)

[ShadowJonathan]

This adds a bunch of tests related to Canonical Aliases (splitting up 2 sytests), and 3 related to deleting aliases in various ways, and 1 wrt listing it.

Sytests cleared;

./tests/30rooms/05aliases.pl:multi_test "Canonical alias can be set",
./tests/30rooms/05aliases.pl:multi_test "Canonical alias can include alt_aliases",
./tests/30rooms/05aliases.pl:test "Alias creators can delete alias with no ops",
./tests/30rooms/05aliases.pl:test "Alias creators can delete canonical alias with no ops",
./tests/30rooms/05aliases.pl:test "Deleting a non-existent alias should return a 404",
./tests/30rooms/05aliases.pl:test "Only room members can list aliases of a room",