Updated database handling and html parsing and increased integration for plugins

[CreaoticX]

This borrows heavily from Wordpress in order to increase the ability for plugins to integrate with SEO Panel. It does this primarily by adding the ability to incorporate action and filter hooks into the SEO Panel operations and by adding the ability save meta data associated with any data type, but specifically websites, projects, and reports.

Functions to simplify managing settings were also added. Settings can now include arrays and can be excluded from being made constants by adding the prefix 'ign_' to the category.

In the process of adding this functionality, an html parser and a MySQLI database handler were also added to simplify operations, increase readability, and increase security. A mysqli helper file was also added to maintain backwards compatibility until the existing code can be

[sendtogeo]

Hi Team,

Thanks a lot for these changes send by you.

We will verify and will add it to seo panel repository and will update you.

Thansk for the support

[sendtogeo]

Thanks again for the support by writing this much code.

Can you please send the merge request to following develop branch of seo panel

https://github.com/seopanel/Seo-Panel/tree/develop