Use fwb's html parser

* Drop tagsoup as well

* Our minsdk is 26, no need to concern about api compatibility below 24 then

app/src/main/java/com/hippo/text/URLImageGetter.java

@@ -17,6 +17,7 @@
 package com.hippo.text;
 
 import android.graphics.drawable.Drawable;
+import android.text.Html;
 
 import com.hippo.conaco.Conaco;
 import com.hippo.drawable.UnikeryDrawable;