chore: various improvements

1. Return to @deno/emit (simpler for current needs than esbuild)
2. Drop importMap.json in favor of deno.json#/imports
3. Use JSR where applicable
4. Define @lib alias for easier common lib imports
5. Define deno.json/#tasks

Author: mfulton26

2015/day/1/part/1/solve.test.ts

@@ -1,6 +1,6 @@
 import solve from "./solve.ts";
 
-import { assertEquals } from "../../../../../lib/testing/asserts.ts";
+import { assertEquals } from "@std/assert";
 
 Deno.test("(())", expect(0));
 Deno.test("()()", expect(0));

2015/day/1/part/2/solve.test.ts

@@ -1,6 +1,6 @@
 import solve from "./solve.ts";
 
-import { assertEquals } from "../../../../../lib/testing/asserts.ts";
+import { assertEquals } from "@std/assert";
 
 Deno.test(")", expect(1));
 Deno.test("()())", expect(5));

2015/day/10/part/1/solve.test.ts

@@ -1,6 +1,6 @@
 import { lookAndSay } from "./solve.ts";
 
-import { assertEquals } from "../../../../../lib/testing/asserts.ts";
+import { assertEquals } from "@std/assert";
 
 Deno.test("lookAndSay", async (t) => {
   await t.step("1", expect("11"));

2015/day/10/part/2/solve.test.ts

@@ -1,6 +1,6 @@
 import { lookAndSay } from "./solve.ts";
 
-import { assertEquals } from "../../../../../lib/testing/asserts.ts";
+import { assertEquals } from "@std/assert";
 
 Deno.test("lookAndSay", async (t) => {
   await t.step("1", expect("11"));

2015/day/11/part/1/solve.test.ts

@@ -1,6 +1,6 @@
 import solve, { isValidPassword } from "./solve.ts";
 
-import { assertEquals } from "../../../../../lib/testing/asserts.ts";
+import { assertEquals } from "@std/assert";
 
 Deno.test("isValidPassword", async (t) => {
   await t.step("hijklmmn", expect(false));

2015/day/11/part/2/solve.test.ts

@@ -1,6 +1,6 @@
 import { isValidPassword } from "./solve.ts";
 
-import { assertEquals } from "../../../../../lib/testing/asserts.ts";
+import { assertEquals } from "@std/assert";
 
 Deno.test("isValidPassword", async (t) => {
   await t.step("hijklmmn", expect(false));

2015/day/12/part/1/solve.test.ts

@@ -1,6 +1,6 @@
 import solve from "./solve.ts";
 
-import { assertEquals } from "../../../../../lib/testing/asserts.ts";
+import { assertEquals } from "@std/assert";
 
 Deno.test("[1,2,3]", expect(6));
 Deno.test('{"a":2,"b":4}', expect(6));

2015/day/12/part/2/solve.test.ts

@@ -1,6 +1,6 @@
 import solve from "./solve.ts";
 
-import { assertEquals } from "../../../../../lib/testing/asserts.ts";
+import { assertEquals } from "@std/assert";
 
 Deno.test("[1,2,3]", expect(6));
 Deno.test('[1,{"c":"red","b":2},3]', expect(4));

2015/day/13/part/1/solve.test.ts

@@ -1,6 +1,6 @@
 import solve from "./solve.ts";
 
-import { assertEquals } from "../../../../../lib/testing/asserts.ts";
+import { assertEquals } from "@std/assert";
 
 Deno.test("example", () => {
   const input = `\

2015/day/13/part/1/solve.ts

@@ -1,4 +1,4 @@
-import permute from "../../../../../lib/permute.ts";
+import permute from "@lib/permute.ts";
 
 export default function solve(input: string) {
   const graph = parsePotentialHappinessGraph(input);