Add deb and rpm distribution to CI

It would be nice to have hobbits packaged in a way that let plugin developers update the application/headers/library easily using a package manager. We could provide the following packages:
- **hobbits-devel** (requires everything?)
- **hobbits** (requires everything except libhobbits-devel and hobbits-qt-creator-wizards)
- **hobbits-gui** (gui binary, requires libs and plugins)
- **hobbits-runner** (CLI runner binary, requires libs and plugins)
- **hobits-core-plugins** (core plugin binaries, requires libs)
- **hobbits-qt-creator-wizards** (wizard templates for Qt creator)
- **libhobbits-devel** (includes headers for plugin development, requires libs)
- **libhobbits** (binary libraries, requires Qt 5.12+)

A few non-trivial things that might need to be addressed:
- where do we host these?
- which parts of hobbits-core are "public"? everything right now?
- how do we make the packages? (seems like CMake can help, see #13 )

@KOLANICH

Start by reviewing the CMake packaging approach referenced in issue #13 and the repository's CI configuration. Define the public package boundaries, dependencies, hosting location, and CI steps for producing deb and rpm packages; done means the proposed hobbits, library, plugin, and development packages are built and distributed consistently.

Written by the indexing model from the issue text.