Deal with code smells.

[Pheotis]

Get rid of:

• Auto-generated method stub TODOs
• Virtual Portal vehicle compatibility

Future concerns:

• UPKEEP_COST is unimplemented
• DEFAULT_TERMINAL_NAME is unimplemented

Possible improvements:

• Complaint about naming in SQLQuery
• Missing specific event for allowing/disallowing a Stargate destroyed by an explosion
• There is no actual validation of whether something is a valid block in GateControlBlock
• Possible material optimization in PlayerEventListener.onPlayerInteract
• Possibly unnecessary line in BlockEventListenerTest
• Teleporter.hasPermission has no permission check for inter-server teleportation
• It's not possible to override the destination of a virtual portal
• StorageType (formerly PortalType) is kind of unnecessary as one can look for the FANCY_INTERSERVER flag
• In Stargate.saveDefaultGates it would be nice to not have to hard-code every default gate.

Should be fixed:

• AbstractPortal.setNetwork does not alter the database
• AbstractPortal.setOwner does not alter the database
• The sign format event is not called every time a sign is formatted, making a plugin overriding the format impossible
• PortalCreationhelper.tryPortalCreation creates a message which is unused
• In ButtonHelper.getButtonMaterial it seems that creating a Stargate with a solid block as the closed material would create a normal button even if the Stargate is underwater.

[Pheotis]

Going to hijack this issue to encompass all of the code smells as tracked on sonar.
https://sonarcloud.io/project/issues?resolved=false&types=CODE_SMELL&id=stargate-rewritten_Stargate-Bukkit