Rename acl:defaultForNew to acl:default

[dmitrizagidulin]

As discussed during several dev meetings, the semantics of the currently implemented acl:defaultForNew predicate are slightly off, and are more appropriate to be named acl:default.

The consensus was to rename existing usage of acl:defaultForNew predicate in the ACLs of Gold and LDNode installations. (And also have a transitionary period where the server supports both predicates for a few versions, and just gives a deprecation warning for defaultForNew).

To do:

• implement support for acl:default in solid-permissions (it should also handle legacy acl:defaultForNew)
• implement support for acl:default in solid-ui/src/acl.js
• implement support for acl:default in node-solid-server (switch default account template to use it)
• mass-rename existing ACL files (using sed or equivalent) on solid.community and solidtest.space