Move base plugins to their respective packages

Move BaseControllerPlugin to controller/src/BaseControllerPlugin.ts
Move BaseInstancePlugin to host/src/BaseInstancePlugin.ts
Move BaseControlPlugin to ctl/src/BaseCtlPlugin.ts
Move BaseWebPlugin to web_ui/src/BaseWebPlugin.ts

This solves the circular package dependency problem of the base plugins
needing types that are available only in the dependencies to lib.

test/controller/BaseControllerPlugin.js

@@ -0,0 +1,22 @@
+"use strict";
+const mock = require("../mock");
+const controller = require("@clusterio/controller");
+
+describe("controller/src/BaseControllerPlugin", function() {
+	describe("class BaseControllerPlugin", function() {
+		let controllerPlugin;
+		it("should be constructible", async function() {
+			controllerPlugin = new controller.BaseControllerPlugin({}, {}, {}, new mock.MockLogger());
+			await controllerPlugin.init();
+		});
+		it("should define defaults for hooks", async function() {
+			await controllerPlugin.onInstanceStatusChanged({}, "running", "initialized");
+			await controllerPlugin.onControllerConfigFieldChanged({}, "foo", null);
+			await controllerPlugin.onInstanceConfigFieldChanged({}, {}, "foo", null);
+			await controllerPlugin.onMetrics();
+			await controllerPlugin.onShutdown();
+			controllerPlugin.onHostConnectionEvent({}, "connect");
+			await controllerPlugin.onPrepareHostDisconnect({});
+		});
+	});
+});