Add input handling

frontend/src/scripts/commands/command-broadcaster.ts

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+import { CommandReceiver } from './command-receiver';
+import { CommandGenerator } from './command-generator';
+
+export class CommandBroadcaster {
+  constructor(
+    commandGenerators: Array<CommandGenerator>,
+    commandReceivers: Array<CommandReceiver>
+  ) {
+    commandReceivers.forEach((r) =>
+      commandGenerators.forEach((g) => g.subscribe(r))
+    );
+  }
+}

frontend/src/scripts/commands/command-generator.ts

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+import { CommandReceiver } from './command-receiver';
+import { Command } from './command';
+
+export class CommandGenerator {
+  private subscribers: Array<CommandReceiver> = [];
+
+  public subscribe(subscriber: CommandReceiver): void {
+    this.subscribers.push(subscriber);
+  }
+
+  protected sendCommand(command: Command): void {
+    this.subscribers.forEach((s) => s.sendCommand(command));
+  }
+}

frontend/src/scripts/commands/command-receiver.ts

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+import { Command } from './command';
+
+export interface CommandReceiver {
+  sendCommand(command: Command): void;
+}

frontend/src/scripts/commands/command.ts

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+import { Typed } from '../transport/serializable';
+
+export abstract class Command extends Typed {}

frontend/src/scripts/commands/types/key-down.ts

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+import { Command } from '../command';
+
+export class KeyDownCommand extends Command {
+  public constructor(public readonly key: string) {
+    super();
+  }
+}

frontend/src/scripts/commands/types/key-up.ts

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+import { Command } from '../command';
+
+export class KeyUpCommand extends Command {
+  public constructor(public readonly key: string) {
+    super();
+  }
+}

frontend/src/scripts/commands/types/primary-action.ts

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+import { Command } from '../command';
+import { Vec2 } from '../../math/vec2';
+
+export class PrimaryActionCommand extends Command {
+  public constructor(public readonly position: Vec2) {
+    super();
+  }
+}

frontend/src/scripts/commands/types/secondary-action.ts

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+import { Command } from '../command';
+import { Vec2 } from '../../math/vec2';
+
+export class SecondaryActionCommand extends Command {
+  public constructor(public readonly position: Vec2) {
+    super();
+  }
+}

frontend/src/scripts/commands/types/swipe.ts

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+import { Command } from '../command';
+import { Vec2 } from '../../math/vec2';
+
+export class SwipeCommand extends Command {
+  public constructor(public readonly delta: Vec2) {
+    super();
+  }
+}