The "core" macro conditions and actions have been extracted out to the
"base" plugin.
The library now mostly contains functionality which is required across
all plugins and (e.g. definitions for macro segments).
The goal is to reduce the complexity and cross-dependencies and group
the source files in a better way.
This should relsove the "library limit of 65535 objects exceeded" build
issue occuring in some Windows build environments.
Based on OBS plugin template build scripts with some minor adjustments:
* Adjust format check scripts to exclude ./deps folder
* Adjust release scripts to only draft releases
* Always build installers
* Always upload build artefacts
* Build opencv for Mac and Windows releases
