When switching themes, set previous theme mods as autoload = no

[igmoweb]

When a theme is switched, previous theme mods are yet autoloaded. This will start filling up the autoloaded options list if you change of Theme often. Normally this won't happen often but we had an issue like this in a big multisite where a user had many sites and he switched themes many times and PHP got out of memory when loading the user in wp-admin.

In any case, it's a good idea to:

• Set autoload = no for previous theme mods
• Set autoload = yes again for the new switched theme

[igmoweb]

Patch

[igmoweb]

Unit Tests