Reduced MadHatter access to db

[Pingdred]

Description

Get active plugins from DB only when find_plugins is called (find_plugins is called also at MadHatter init), when a plugin is activated/deactivated the DB is kept in sync saving the new list of active plugins.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[pieroit]

Thanks