libgnt/libgnt

Migrate to gi-docgen

2021-09-30, Gary Kramlich
cb37ee7c7a93
Migrate to gi-docgen

Testing Done:
built the docs and verified they were working as expected.

Reviewed at https://reviews.imfreedom.org/r/952/
option('doc', type : 'boolean', value : true, yield : true,
description : 'build documentation with gtk-doc')
option('introspection', type : 'boolean', value : true, yield : true,
description : 'build introspection data')