talkatu/talkatu

Add the gir target to the library dependency object and other meson cleanups.

Testing Done:
Compiled

Reviewed at https://reviews.imfreedom.org/r/941/
# Building
Talkatu uses [meson](https://mesonbuild.com) as it's build system.
Meson requires you to build in a directory other than the source directory.
To compile you can use the following commands:
```
meson build
cd build
ninja install
```