gplugin/gplugin

Bump the minimum meson to 0.61.0 and clean up some warnings

2022-04-18, Gary Kramlich
55291fd09e7d
Bump the minimum meson to 0.61.0 and clean up some warnings

Testing Done:
Compiled.

Reviewed at https://reviews.imfreedom.org/r/1350/
Title: Python3 Plugins
Slut: python3
## Python3 Plugins
> You **MUST** have the Python3 loader plugin installed and working as well as
> the gobject-introspection package for GPlugin installed to use Python3
> plugins.
### Example Python Plugin
Like all plugins in GPlugin, Python plugins must also implement the
`gplugin_query`, `gplugin_load`, and `gplugin_unload` functions.
The following is a basic Python plugin.
```python
import gi
gi.require_version("GPlugin", "0.0")
from gi.repository import GPlugin
def gplugin_plugin_query():
return GPlugin.PluginInfo(
id="gplugin-python/basic-plugin",
abi_version=0x01020304,
name="basic plugin",
authors=["author1"],
category="test",
version="version",
license_id="license",
summary="summary",
website="website",
description="description",
)
def gplugin_plugin_load(plugin):
return True
def gplugin_plugin_unload(plugin):
return True
```