carve out States Ui functionality

Much of the original code in custom-ui is for Home Assistant States ui.
This is a further attempt to carve out many lines of code

BETA: further diminish redundant code

Next to an easier versioning, this is an attempt to further cut unnecessary/unused code, in trying to delete as many remnants of the old 'States' version as possible.

Please be aware for possible errors, and report issues if they arise. Also, please have a look if you spot further code to be deleted ;-)
installation:

- url: /local/lovelace/resources/custom-ui/custom-ui-beta.js?v=20210323-BETA
  type: module

align device_class, take out obsolete configuration options

device_classes have been changed in HA Core, this updates these classes in Custom-ui

obsolete (used in home Assistant States ui) were still visible in the /configuration/customizations menu. This takes out those options to prevent confusion.

include majorVersion in more-info logic

changed version logic for more-info to include majorVersion

fixed more-info in HA 2020.X.X new numbering

fixes more-info because of new numbering system in HA releases.
fixes #26

updated for HA 118

Updated for HA 118

Handle nested items in a group dynamically

Update to handle nested items in a group dynamically