Order of YANG statement arrangements in the generated YANG module

[bzeuner]

It would be easier to read the YANG module if there is a common order of the yang statements as defined in RFC 8407 Appendix B and the grouping statments are enhanced in the Mapping Guidelines, section 10:

• extension statements
• feature statements
• identity statements
• typedef statements
• grouping statements for complex data types
• grouping statements for object references
• grouping statements for object-classes
• data definition statements
• augment statements
• rpc statements
• notification statements