gplugin/gplugin

Bump the minimum meson to 0.56, fix deprecations, and start using summary()

2021-07-27, Gary Kramlich
b270797db56a
Bump the minimum meson to 0.56, fix deprecations, and start using summary()

Testing Done:
Ran `meson --wipe` with options toggled. See https://asciinema.org/a/QyLyX1lAchqLu6NcA2J5iBhFl

Reviewed at https://reviews.imfreedom.org/r/849/
syntax: glob
.*.swp
*.debhelper
*.orig
*.pyc
*.ui~
\#*.ui\#
syntax: regexp
^build.*\/
^packaging\/debian\/tmp\/
^packaging\/debian\/(.+\.)?(substvars|debhelper\.log)$
^packaging\/debian\/build.*\/
^packaging\/debian\/libgplugin0?(-.+)?\/
^packaging\/debian\/gir1.2-gplugin-0.0\/
^packaging\/debian\/files$
^po\/.*\.pot$
^obj-x86_64-linux-gnu\/
^debian\/?$