Added missing main class

The class `PMXI_Plugin` and the function `wp_all_import_pro_updater()` are "hidden" behind a `if` statement:

```
if ( is_plugin_active( 'wp-all-import/plugin.php' ) ) {
```

This prevents the php parser to do its job.
A new script has been added to remove the `if` statement, allowing the parser to find these nodes.

composer.json

@@ -6,6 +6,7 @@
 	"type": "library",
 	"require-dev": {
 		"php": "~7.1",
-		"giacocorsiglia/stubs-generator": "^0.5.0"
+		"giacocorsiglia/stubs-generator": "^0.5.0",
+        "symfony/console": "^4.0"
 	}
 }

fix-main-file.php

@@ -0,0 +1,59 @@
+<?php
+/**
+ * The class `PMXI_Plugin` and the function `wp_all_import_pro_updater()` are "hidden" behind a `if` statement:
+ * `if ( is_plugin_active( 'wp-all-import/plugin.php' ) ) {`
+ * This prevents the php parser to do its job.
+ * This script removes the `if` statement, allowing the parser to find these nodes.
+ */
+namespace Polylang\WP_All_Import_Pro_Stubs;
+
+use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Console\Output\ConsoleOutput;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+if ( file_exists( __DIR__ . '/vendor/autoload.php' ) ) {
+	require __DIR__ . '/vendor/autoload.php';
+}
+
+function remove_if_else_statement() {
+	$rel_path  = "wp-all-import-pro/wp-all-import-pro.php";
+	$full_path = __DIR__ . '/' . $rel_path;
+	$io        = new SymfonyStyle( new ArgvInput(), new ConsoleOutput() );
+
+	$io->title( 'Replacements in original main file' );
+
+	if ( ! file_exists( $full_path ) ) {
+		$io->error( "Failed to locate file $rel_path." );
+		return;
+	}
+
+	try {
+		$contents = file_get_contents( $full_path );
+
+		if ( ! is_string( $contents ) ) {
+			$io->error( "Failed to open file $rel_path." );
+			return;
+		}
+	} catch( Exception $e ) {
+		$io->error( "Failed to open file $rel_path." );
+		return;
+	}
+
+	$pattern = "@if\s*\(\s*is_plugin_active\(\s*'wp-all-import/plugin.php'\s*\)\s*\)\s*\{.+\}\s*else\s*\{(?<code>.*)\}\s*$@Us";
+
+	if ( ! preg_match( $pattern, $contents, $matches ) ) {
+		$io->error( "Could not find the part to remove in file $rel_path." );
+		return;
+	}
+
+	$contents = str_replace( $matches[0], $matches['code'] . "\n", $contents );
+	$result   = file_put_contents( $full_path, $contents );
+
+	if ( false === $result ) {
+		$io->error( "Failed to perform replacements in file $rel_path." );
+	} else {
+		$io->success( "Replacements done in file $rel_path." );
+	}
+}
+
+remove_if_else_statement();

install-plugin.sh

@@ -79,3 +79,5 @@ download_plugin() {
 
 # Download WP All Import Pro
 download_plugin wp-all-import-pro
+
+php fix-main-file.php