uninstall.js: Complete rewrite of the uninstall code, adds Flatpak/Snap

- Now uses clearer variable names and improved code formatting.

- Improved the GUI's logging messages, with better explanations such as "restarting" instead of "killing", since non-technical users are the primary audience of BetterDiscord-Installer.

- Added detailed comments for future maintainers/contributors.

src/renderer/actions/uninstall.js

@@ -1,6 +1,4 @@
 import {promises as fs} from "fs";
-import originalFs from "original-fs";
-import rimraf from "rimraf";
 import path from "path";
 
 import {progress} from "../stores/installation";
@@ -23,14 +21,14 @@ async function deleteShims(paths) {
     const progressPerLoop = (DELETE_SHIM_PROGRESS - progress.value) / paths.length;
     for (const discordPath of paths) {
         const indexFile = path.join(discordPath, "index.js");
-        log("Removing " + indexFile);
+        log(`Removing injection scripts from: ${discordPath}.`);
         try {
             if (await exists(indexFile)) await fs.writeFile(indexFile, `module.exports = require("./core.asar");`);
-            log("✅ Deletion successful");
+            log("✅ Uninstalled successfully.");
             progress.set(progress.value + progressPerLoop);
         }
         catch (err) {
-            log(`❌ Could not delete file ${indexFile}`);
+            log(`❌ Could not uninstall BetterDiscord from ${discordPath}.`);
             log(`❌ ${err.message}`);
             return err;
         }
@@ -44,22 +42,26 @@ export default async function(config) {
     if (!sane) return fail();
 
 
+    // Installation channels (such as "stable", "canary") and their latest version's paths.
     const channels = Object.keys(config);
     const paths = Object.values(config);
 
 
-    lognewline("Deleting shims...");
+    // Remove BetterDiscord from each Discord version's loader-script.
+    lognewline("Deleting BetterDiscord's loader scripts...");
     const deleteErr = await deleteShims(paths);
     if (deleteErr) return fail();
-    log("✅ Shims deleted");
+    log("✅ Loader scripts deleted.");
     progress.set(DELETE_SHIM_PROGRESS);
 
 
-    lognewline("Killing Discord...");
+    // Automatically restart Discord clients if they are running.
+    lognewline("Restarting Discord...");
     const killErr = await kill(channels, (RESTART_DISCORD_PROGRESS - progress.value) / channels.length);
-    if (killErr) showRestartNotice(); // No need to bail out
-    else log("✅ Discord restarted");
+    if (killErr) showRestartNotice(); // No need to bail out if we failed, just tell user to restart manually.
+    else log("✅ Discord restarted.");
     progress.set(RESTART_DISCORD_PROGRESS);
 
+
     succeed();
 };