[cXF] Login or Register on thread view 1.3.4

Description:
Add a block for login or register on the thread view bottom.

Features:

• option to open the button register/login in an overlay
• option to show a block for login and register on thread view after the first and last thread post or only after the last thread post
• option to show a block for login and register on the forum view above and below the thread list or only below the thread list
• all texts are fully phrased (check phrases for this add-on to edit)
• all texts are fully phrased (check phrases for this add-on to edit)
• highly customizable in style properties (change the background color for each block separately, style title and description, change icon, style buttons etc.)
• responsive