Ğ1 monetary license update and license handling refactoring

• Rename license-G1 subtree folder to g1_monetary_license
• Update g1_monetary_license subtree
• Document g1 monetary license updating process
• Include g1_monetary_license files to the package
• Import complete click module
• Refactor license cmd

Close #221 (closed), #308 (closed), #392 (closed).

g1_monetary_license/README.md

+# G1 monetary license
+
+## Available languages
+- [(`en`) English](g1_monetary_license_en.rst)
+- [(`eo`) Esperanto](g1_monetary_license_eo.rst)
+- [(`es`) Spanish](g1_monetary_license_es.rst)
+- [(`fr`) French](g1_monetary_license_fr.rst)
+- [(`pt`) Portuguese](g1_monetary_license_pt.rst))