refactor!: organize directories and files (#268)

* refactor!: organize directory structure

* fix: avoid stack overflow err

* chore: swtch back to std/encoding for base64

* style: format source files

src/api/structures/mod.ts

@@ -0,0 +1,29 @@
+import { createChannel } from "./channel.ts";
+import { createGuild } from "./guild.ts";
+import { createMember } from "./member.ts";
+import { createMessage } from "./message.ts";
+import { createRole } from "./role.ts";
+import { createTemplate } from "./template.ts";
+
+/** This is the placeholder where the structure creation functions are kept. */
+export let structures = {
+  createChannel,
+  createGuild,
+  createMember,
+  createMessage,
+  createRole,
+  createTemplate,
+};
+
+export type Structures = typeof structures;
+
+/** This function is used to update/reload/customize the internal structure of Discordeno.
+ *
+ *  ⚠️ **ADVANCED USE ONLY: If you customize this in a wrong way, you could potentially create many new errors/bugs. Please take caution when using this.
+*/
+export function updateStructures(newStructures: Structures) {
+  structures = {
+    ...structures,
+    ...newStructures,
+  };
+}