Add Warning and comment about ignore rules that target an existing member but do not have it as a source
No longer ignore rules that target an existing member but do not have it as a source; instead this rule signal that the input should be ignored.
Issue an error/warning when the source field of a rule is not a list of "type name"
Revert "Issue an error/warning when the source field of a rule is not a list of "type name""

This reverts commit 141f534e4dfd5fd1ff0346716a7e9f0bd39fa8a1.