Form editor

- new/edit in forms listing goes to editor
- fixed editor dependencies (via Webpack)
- updated forms table schema
- saving/loading a form works

lib/Form/Block/Input.php

@@ -0,0 +1,31 @@
+<?php
+namespace MailPoet\Form\Block;
+
+class Input extends Base {
+
+  static function render($block) {
+    $html = '';
+
+    $html .= '<p class="mailpoet_paragraph">';
+
+    $html .= static::renderLabel($block);
+
+    $html .= '<input type="text" class="mailpoet_input" ';
+
+    $html .= 'name="'.static::getFieldName($block).'" ';
+
+    $html .= 'title="'.static::getFieldLabel($block).'" ';
+
+    $html .= 'value="'.static::getFieldValue($block).'" ';
+
+    $html .= static::renderInputPlaceholder($block);
+
+    $html .= static::getInputValidation($block);
+
+    $html .= '/>';
+
+    $html .= '</p>';
+
+    return $html;
+  }
+}