Released v4.3.0

• Fixed: cxc_rcdGetMsg_s(): in case when the scope ptr is NULL, use cxc_scope pointer. The behaviour is now consistent with code generated by rcd_autogen.
• Added: CXC_INIT(): checking if the cxc_stack is already initialized -> error.
• Added: cxc_initialized(): returns non-zero if cxc_stack is initialized.