Move mapper names from rom.js to each mapper class

The ROM class had a large array mapping mapper numbers to names, which
was only used in an error message that always showed "Unknown Mapper"
for unsupported mappers. Move names to static mapperName properties on
each mapper class and correct them to match nesdev wiki nomenclature.

Remove the now-unused getMapperName() method.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: bfirsh

src/mappers/mapper0.js

@@ -1,6 +1,8 @@
 import { copyArrayElements } from "../utils.js";
 
 class Mapper0 {
+  static mapperName = "NROM";
+
   constructor(nes) {
     this.nes = nes;
 

src/mappers/mapper1.js

@@ -1,6 +1,8 @@
 import Mapper0 from "./mapper0.js";
 
 class Mapper1 extends Mapper0 {
+  static mapperName = "MMC1";
+
   constructor(nes) {
     super(nes);
 

src/mappers/mapper11.js

@@ -7,6 +7,8 @@ import Mapper0 from "./mapper0.js";
  * @example Crystal Mines, Metal Fighter
  */
 class Mapper11 extends Mapper0 {
+  static mapperName = "Color Dreams";
+
   constructor(nes) {
     super(nes);
   }

src/mappers/mapper140.js

@@ -7,6 +7,8 @@ import Mapper0 from "./mapper0.js";
  * @example Bio Senshi Dan - Increaser Tono Tatakai
  */
 class Mapper140 extends Mapper0 {
+  static mapperName = "Jaleco JF-11/JF-14";
+
   constructor(nes) {
     super(nes);
   }

src/mappers/mapper180.js

@@ -7,6 +7,8 @@ import Mapper0 from "./mapper0.js";
  * @example Crazy Climber
  */
 class Mapper180 extends Mapper0 {
+  static mapperName = "UNROM (Crazy Climber)";
+
   constructor(nes) {
     super(nes);
   }

src/mappers/mapper2.js

@@ -1,6 +1,8 @@
 import Mapper0 from "./mapper0.js";
 
 class Mapper2 extends Mapper0 {
+  static mapperName = "UxROM";
+
   constructor(nes) {
     super(nes);
   }

src/mappers/mapper240.js

@@ -8,6 +8,8 @@ import Mapper0 from "./mapper0.js";
  * https://blog.heheda.top
  */
 class Mapper240 extends Mapper0 {
+  static mapperName = "Mapper 240";
+
   constructor(nes) {
     super(nes);
   }

src/mappers/mapper241.js

@@ -7,6 +7,8 @@ import Mapper0 from "./mapper0.js";
  * https://blog.heheda.top
  */
 class Mapper241 extends Mapper0 {
+  static mapperName = "BxROM (Mapper 241)";
+
   constructor(nes) {
     super(nes);
   }

src/mappers/mapper3.js

@@ -7,6 +7,8 @@ import Mapper0 from "./mapper0.js";
  * @description http://wiki.nesdev.com/w/index.php/INES_Mapper_003
  */
 class Mapper3 extends Mapper0 {
+  static mapperName = "CNROM";
+
   constructor(nes) {
     super(nes);
   }

src/mappers/mapper34.js

@@ -7,6 +7,8 @@ import Mapper0 from "./mapper0.js";
  * @example Darkseed, Mashou, Mission Impossible 2
  */
 class Mapper34 extends Mapper0 {
+  static mapperName = "BNROM";
+
   constructor(nes) {
     super(nes);
   }