Move help to JSON and add server docstrings

client/public/help.json

@@ -0,0 +1,52 @@
+{
+  "sections": [
+    {
+      "title": "Movement",
+      "items": [
+        { "keys": "Arrow Keys", "description": "Move" },
+        { "keys": "C", "description": "Speak coordinates" },
+        { "keys": "Escape", "description": "Disconnect/cancel" }
+      ]
+    },
+    {
+      "title": "Users, Nickname, and Chat",
+      "items": [
+        { "keys": "L", "description": "Locate nearest user" },
+        { "keys": "Shift+L", "description": "List users" },
+        { "keys": "Shift+U", "description": "Speak connected users" },
+        { "keys": "N", "description": "Change nickname" },
+        { "keys": "Slash", "description": "Start chat" },
+        { "keys": "Comma / Period", "description": "Previous/next message" },
+        { "keys": "Less Than / Greater Than", "description": "First/last message" }
+      ]
+    },
+    {
+      "title": "Items",
+      "items": [
+        { "keys": "I", "description": "Locate nearest item" },
+        { "keys": "Shift+I", "description": "List items" },
+        { "keys": "A", "description": "Add item" },
+        { "keys": "O", "description": "Edit item properties" },
+        { "keys": "Shift+O", "description": "Read all item properties" },
+        { "keys": "D", "description": "Pick up/drop item" },
+        { "keys": "Shift+D", "description": "Delete item" },
+        { "keys": "U", "description": "Use item" }
+      ]
+    },
+    {
+      "title": "Audio",
+      "items": [
+        { "keys": "P", "description": "Ping server" },
+        { "keys": "M", "description": "Mute/unmute yourself" },
+        { "keys": "Shift+M", "description": "Toggle stereo/mono output" },
+        { "keys": "! (Shift+1)", "description": "Toggle loopback monitor" },
+        { "keys": "1", "description": "Toggle voice layer" },
+        { "keys": "2", "description": "Toggle item sounds layer" },
+        { "keys": "3", "description": "Toggle media layer" },
+        { "keys": "4", "description": "Toggle world layer (other users)" },
+        { "keys": "E", "description": "Select voice effect" },
+        { "keys": "Dash or Equals", "description": "Lower/raise active effect value" }
+      ]
+    }
+  ]
+}