Bomb Direction (#2435)

Resolves #2434 

## Description:

Allows bomb direction to be inverted by pressing a hotkey - currently
"U".

**Check the issue for screenshots / videos.**

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

w.o.n

---------

Co-authored-by: Evan <evanpelle@gmail.com>
Co-authored-by: iamlewis <lewismmmm@gmail.com>

src/client/InputHandler.ts

@@ -89,6 +89,8 @@ export class GhostStructureChangedEvent implements GameEvent {
   constructor(public readonly ghostStructure: UnitType | null) {}
 }
 
+export class SwapRocketDirectionEvent implements GameEvent {}
+
 export class ShowBuildMenuEvent implements GameEvent {
   constructor(
     public readonly x: number,
@@ -200,6 +202,7 @@ export class InputHandler {
       attackRatioUp: "KeyY",
       boatAttack: "KeyB",
       groundAttack: "KeyG",
+      swapDirection: "KeyU",
       modifierKey: isMac ? "MetaLeft" : "ControlLeft",
       altKey: "AltLeft",
       buildCity: "Digit1",
@@ -427,6 +430,11 @@ export class InputHandler {
         this.setGhostStructure(UnitType.MIRV);
       }
 
+      if (e.code === this.keybinds.swapDirection) {
+        e.preventDefault();
+        this.eventBus.emit(new SwapRocketDirectionEvent());
+      }
+
       // Shift-D to toggle performance overlay
       console.log(e.code, e.shiftKey, e.ctrlKey, e.altKey, e.metaKey);
       if (e.code === "KeyD" && e.shiftKey) {