Rename gdbus-codegen --glib-min-version argument to --glib-min-required and add --glib-max-allowed
See !1286 (comment 669312). Make the --glib-min-version
argument more like the GLIB_VERSION_MIN_REQUIRED
and GLIB_VERSION_MAX_ALLOWED
API macros so that the codegen has upper and lower bounds on what versions it can depend on.
This needs to be done before API freeze for 2.64, since --glib-min-version
is the current gdbus-codegen
API, introduced in 2.63.3.