Refactor build tasks and config file

Changed:
- Renamed 'mconfig.json' to 'loconfig.json'.
- Renamed 'concat.js' to 'concats.js' to represent flexible functionality.
- loconfig.json: Base paths are nested under "paths".
- loconfig.json: Paths for tasks are nested under "tasks".
- Refactored each task to process corresponding entries under "tasks" in 'loconfig.json'.
- watch.js: Changed concats watch to use task's includes.

Added:
- tiny-glob v0.2.9
- Utility 'glob.js' to use dynamic imports to fetch an available glob function from node modules.
- Utility 'template.js' to provide a function to render template tags (`{% ... %}`) in tasks.
- concats.js: Support for concatenating groupes of files.
- scripts.js: Support for ESBuild's "outdir" option.

build/tasks/concats.js

@@ -0,0 +1,45 @@
+import loconfig from '../../loconfig.json';
+import glob from '../utils/glob.js';
+import message from '../utils/message.js';
+import notification from '../utils/notification.js';
+import template from '../utils/template.js';
+import concat from 'concat';
+import { basename } from 'node:path';
+
+/**
+ * Concatenates groups of files.
+ */
+export async function concatFiles() {
+    loconfig.tasks.concats.forEach(async ({
+        includes,
+        outfile
+    }) => {
+        const filename = basename(outfile || 'undefined');
+
+        const timeLabel = `${filename} concatenated in`;
+        console.time(timeLabel);
+
+        try {
+            includes = includes.map((path) => template(path));
+            outfile  = template(outfile);
+
+            const files = await glob(includes);
+
+            await concat(files, outfile);
+
+            if (files.length) {
+                message(`${filename} concatenated`, 'success', timeLabel);
+            } else {
+                message(`${filename} is empty`, 'notice', timeLabel);
+            }
+        } catch (err) {
+            message(`Error concatenating ${filename}`, 'error');
+            message(err);
+
+            notification({
+                title:   `${filename} concatenation failed 🚨`,
+                message: `${err.name}: ${err.message}`
+            });
+        }
+    });
+};