Add meson buildsystem

[lleon95]

This feature:

• Adds the meson building system
• Adds the option to compile the library and the application or just the library

Instructions:

# Create project
meson builddir -Denable-nethogs-app=enabled -Denable-libnethogs=disabled
# Compile
ninja -C builddir
# Install
ninja -C builddir install

[raboof]

Thanks for this contribution!

I'm generally not opposed to the change. This of course does slightly increase the maintenance burden, I hope you stick around to help with that as well :).

I added some comments

[raboof]

specifying '0.8.7' here seems a bit weird, since the current main branch is '0.8.7 and a bit'. Is there any convention in the meson ecosystem to deal with the version differently, perhaps similar to what the Makefile does?

Also, the formatting seems somewhat haphazard (e.g., when do use newlines and when not). Is there any formatting tool for meson build files? Did you use it?

[lleon95]

Unfortunately there is not a tool, but here is the style guide: https://mesonbuild.com/Style-guide.html

Let me see how I can fix the version. Probably I can get it from your version script

[lleon95]

I have added the detection of the version from the tag as in the Makefiles.

[raboof]

It kinda feels like the defaults should be the other way around: nethogs is primarily a CUI tool, and having it as a library is a somewhat experimental edge case.

[lleon95]

Now, I have added both options (I will be using the library)

[raboof]

cool, thanks!