Add an inline variable for the addon version

`__addon_version__` is now a global variable that's usable within an addon which will get replaced at compile-time with the version found in the corresponding manifest file

.eslintrc.js

@@ -30,7 +30,8 @@ module.exports = {
 		'__webpack_hash__': false,
 		'__git_commit__': false,
 		'FrankerFaceZ': false,
-		'Addon': false
+		'Addon': false,
+		'__addon_version__': false,
 	},
 	'rules': {
 		'accessor-pairs': ['error'],

webpack.config.js

@@ -182,6 +182,7 @@ const config = {
 
 	module: {
 		rules: [
+			// Register method replace to include the addon's name
 			{
 				test: /index\.jsx?$/,
 				exclude: /node_modules/,
@@ -197,6 +198,23 @@ const config = {
 					}
 				}
 			},
+			// Inline variable for addon version
+			{
+				test: /\.jsx?$/,
+				exclude: /node_modules/,
+				loader: 'string-replace-loader',
+				options: {
+					search: /__addon_version__/g,
+					replace(match, offset, string) {
+						let folder = path.relative(this.rootContext, path.dirname(this.resource));
+						if ( folder.startsWith('src\\') || folder.startsWith('src/') )
+							folder = folder.split(path.sep)[1];
+
+						const manifest = MANIFESTS[folder];
+						return JSON.stringify(manifest?.version ?? '0.0.0-unknown');
+					}
+				}
+			},
 			{
 				test: /\.jsx?$/,
 				exclude: /node_modules/,