Placeholder pAIs, ghost role rules window (#4972)

Resources/Locale/en-US/ghost/roles/ghost-role-component.ftl

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+# also used in MakeGhostRuleWindow and MakeGhostRoleCommand
+ghost-role-component-default-rules = You don't remember any of your previous life unless an administrator tells you otherwise.
+

Resources/Locale/en-US/pai/pai-system.ftl

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+pai-system-pai-installed = A pAI is installed.
+pai-system-off = No pAI is installed.
+pai-system-still-searching = Still searching for a pAI.
+pai-system-searching = Now searching for a pAI...
+
+pai-system-role-name = personal ai
+pai-system-role-description = Be someone's electronic pal!
+                              (Memories *not* included.)
+
+pai-system-wipe-device-verb-text = Remove pAI
+pai-system-wiped-device = The pAI was wiped from the device.
+
+pai-system-stop-searching-verb-text = Stop searching
+pai-system-stopped-searching = The device stopped searching for a pAI.
+

Resources/Prototypes/Entities/Objects/Fun/pai.yml

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+# Placeholder PAIs, aka semi-automatic ghost roles
+
+- type: entity
+  parent: BaseItem
+  id: PersonalAI
+  name: personal ai device
+  description: Your electronic pal who's fun to be with!
+  components:
+  - type: Sprite
+    netsync: false
+    sprite: Objects/Devices/pda.rsi
+    layers:
+    - state: pda-lawyer # nobody's using this one
+    - state: pai_off_overlay
+      shader: unshaded
+  - type: Input
+    context: "human"
+  - type: PAI
+  - type: Examiner
+  - type: GhostRadio
+  - type: DoAfter
+  - type: Actions
+    # This has to be installed because otherwise they're not "alive",
+    #  so they can ghost and come back.
+    # Note that the personal AI never "dies".
+  - type: MobState
+    thresholds:
+      0: !type:NormalMobState {}
+  - type: Appearance
+    visuals:
+      - type: GenericEnumVisualizer
+        key: enum.PAIVisuals.Status
+        layer: 1
+        states:
+          enum.PAIStatus.Off: pai_off_overlay
+          enum.PAIStatus.Searching: pda-r
+          enum.PAIStatus.On: pai_overlay
+