Move all HTML sections to separate files

[johnstray]

Move all the HTML sections, mainly in the adminFunctions.php file, to separate files. This make for much easier reading of the code, and much easier updating of the HTML.

[johnstray]

This issue is mainly directed at adminFunctions.php

[johnstray]

Found and removed redundant function - blog_page_help_html()

Function only contained html and was called from another function. The html has been moved to the external html file for the parent function show_help_admin()

[johnstray]

Done! Pages moved:

• Category Management
• Feed Management
• Help Admin
• Post Editor
• Posts Admin
• Settings Main
• Settings RSS