J2Store v4.1.2

What's Changed

• 4.1.2 Installer rewrite and versions harmonization by @j2commerce in #293

Fixed missing language key for menus 'Thank you'.
Added deprecation error suppression in the F0F include file.
Added installer log file.
Renamed fof to lib_fof in the installation package.
Rewrote the installer script to use Joomla and not f0f to initiate an installation.
Removed code coming from Joomla 3 as 4.0.5 needs to be the minimum version we can update from.

This allows:

• check on additional fof libraries that should be removed,
• deprecated error suppression during install and notifications after install,
• check and enabling of the b/c plugin.

Full Changelog: 4.1...4.1.2