Add some more exotic type specialisations of block

src/Components/ContinuableBlock.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Erusev\Parsedown\Components;
+
+use Erusev\Parsedown\Parsing\Context;
+
+interface ContinuableBlock extends Block
+{
+    /**
+     * @param Context $Context
+     * @return static|null
+     */
+    public function continue(Context $Context);
+
+    /**
+     * @param bool $isInterrupted
+     * @return static
+     */
+    public function interrupted($isInterrupted);
+
+    /**
+     * @return bool
+     */
+    public function isInterrupted();
+}

src/Components/StateUpdatingBlock.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Erusev\Parsedown\Components;
+
+use Erusev\Parsedown\State;
+
+interface StateUpdatingBlock extends Block
+{
+    /** @return State */
+    public function latestState();
+}