Add /datum/tgs_version equality support

src/DMAPI/tgs.dm

@@ -127,6 +127,10 @@
 /datum/tgs_version/proc/Wildcard()
 	return
 
+//if the tgs_version equals some other_version
+/datum/tgs_version/proc/Equals(datum/tgs_version/other_version)
+	return
+
 //represents a merge of a GitHub pull request
 /datum/tgs_revision_information/test_merge
 	var/number				//pull request number

src/DMAPI/tgs/core/tgs_version.dm

@@ -20,3 +20,9 @@
 
 /datum/tgs_version/Wildcard()
 	return minor == null || patch == null
+
+/datum/tgs_version/Equals(datum/tgs_version/other_version)
+	if(!istype(other_version))
+		return FALSE
+
+	return major == other_version.major && minor == other_version.minor && patch == other_version.patch && deprecated_patch != other_version.deprecated_patch