Gravity generator rewrite (#4828)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Resources/Prototypes/Entities/Structures/Machines/gravity_generator.yml

@@ -23,7 +23,6 @@
   - type: Transform
     anchored: true
   - type: ApcPowerReceiver
-    powerLoad: 500
   - type: ExtensionCableReceiver
   - type: Physics
     bodyType: Static
@@ -51,6 +50,10 @@
       - !type:DoActsBehavior
         acts: ["Breakage"]
   - type: GravityGenerator
+    idlePower: 15
+    activePower: 500
+    lightRadiusMin: 0.75
+    lightRadiusMax: 2.5
   - type: UserInterface
     interfaces:
       - key: enum.GravityGeneratorUiKey.Key
@@ -63,3 +66,8 @@
         unpowered: "off"
         off: "off"
         on: "on"
+  - type: PointLight
+    energy: 0.5
+    # Gravity generator is a large machine, not casting shadows is fine within the radius set above.
+    castShadows: false
+    color: "#a8ffd9"