Refactor ClassMemberListNode to use CommaListNode for list of members
Refactor EchoTagStatementNode to use CommaListNode
Refactor ConstantDeclarationStatementNode to use CommaListNode
Refactor StaticVariableStatementNode to use CommaListNode
Refactor GlobalStatementNode to use CommaListNode
Refactor EchoStatementNode to use CommaListNode
Refactor DeclareNode to use CommaListNode for list of directives
Refactor UseDeclarationStatementNode to use CommaListNode
Merge pull request #141 from grom358/commalist_refactor

Commalist refactor