support to v12 (it pottentially breaks compatibility to old versions

[mrcomac]

I made some changes to make the module work on v12. These changes may potentially break compatibility with older versions of FoundryVTT.

I saw issue 98 that you are happy to hand over the module to someone but actually, after these changes, you might not need to hand over this module to anyone until you decide whether you will continue working on it or not.

If you need assistance with fixing bugs, I'm happy to help. You need to HO this module I'm happy to keep working on it, and I'll be happy to HO back to you if you decide return to maintain it.

cheers Marcos, (Snagov on discord)