Add some South Atlantic naval assets (#23)

- Unit yamls for several ships and added some new ones to uk_1990.json
- 2 new layouts: Aircraft Carrier / LHA with Frigate escorts
- Add "HMS Invincible" as Control Point

resources/units/ships/CastleClass_01.yaml

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+class: Destroyer
+price: 0
+variants:
+  P258 Leeds Castle: null
+  P265 Dumbarton Castle: null

resources/units/ships/Hms_invincible.yaml

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+class: HelicopterCarrier
+price: 0
+variants:
+  R05 Invincible: null

resources/units/ships/leander-gun-achilles.yaml

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+class: Cruiser
+price: 0
+variants:
+  F12 Achilles: null

resources/units/ships/leander-gun-andromeda.yaml

@@ -0,0 +1,4 @@
+class: Cruiser
+price: 0
+variants:
+  F57 Andromeda: null

resources/units/ships/leander-gun-ariadne.yaml

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+class: Cruiser
+price: 0
+variants:
+  F72 Ariadne: null

resources/units/ships/leander-gun-condell.yaml

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+class: Cruiser
+price: 0
+variants:
+  F233 Marlborough: null
+  FF06 Almirante Condell: null

resources/units/ships/leander-gun-lynch.yaml

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+class: Cruiser
+price: 0
+variants:
+  F80 Grafton: null
+  FF07 Almirante Lynch: null