fix(regex, format): Improve regex boundary matching and remove duplicates (#36)

* tweak(regex):  Improve SM737 boundary matching

* remove(regex): Duplicate patterns created by group tiers

* tweak(group_tiers): Prevent creation of duplicate patterns

* tweak(regex): Use `THREESOME` instead of `threesome`

* tweak(regex): Rename `Colour` to `Colourisation`

* tweak(regex): Improve `Colourisation` description

regex_patterns/SM737.yml

@@ -1,5 +1,5 @@
 name: SM737
-pattern: SM737
+pattern: (?<=^|[\s.-])SM737\b
 description: ''
 tags:
 - Release Group