Added airbase icons, started airbase spawn menu (WiP)

Added unit action menu

client/src/controls/unitcontextmenu.ts

@@ -0,0 +1,18 @@
+import { ContextMenu } from "./contextmenu";
+
+export class UnitContextMenu extends ContextMenu {
+    constructor(id: string) {
+        super(id);
+    }
+
+    setOptions(options: string[], callback: CallableFunction)
+    {
+        this.getContainer()?.replaceChildren(...options.map((option: string) =>
+        {
+            var button = document.createElement("button");
+            button.innerText = option;
+            button.addEventListener("click", () => callback(option));
+            return (button);
+        }));
+    }
+}