- update necessary tests
This removes a lot of complexity because IPv4 and IPv6 addresses can be handled the same way.
To distinguish between them it's enough to take their length into account.
Parsing should be straight forward in any language.
- introduce CLI binary
- move server binary to subdirectory to have a uniformed directory structure
- update goreleaser to build all binaries and create dist packages
- update ignore files accordingly
- use `Unmarshal` method of viper
- move config loading, defaulting and stuff to config package
- move serve to an extra command and move keep only global flags in root command
- add startup logic to onInit method in root command
- update mocks
- clean config structs
- adopt changes in plugins
- update default config
- apply changes in proxy plugin and TLS interceptor
- add HTTPS proxy support
- move ca-generation command to main app
- minor refactoring to improve API stability
- move mocks to extra packages to avoid cycling imports
- fix bug in multi-port configuration
- change HTTP proxy to redirect to HTTP mock instead of maintaining custom rules
- introduce new endpoints module
- introduce Endpoint and EndpointManager
- introduce new Logging abstraction API to allow proper mocking
- add error return value to Start and Shutdown of endpoints
- add mocks of some internals to allow easier testing
- add generate target to take care of all code generation
- HTTPS configuration is till missing
- fix a few minor things in other plugins
- cleanup of config to reduce repeating of the same values multiple times
- add systemd service
- add default file
- improve logging to see what kind of errors might occur
- ship multiple prepared config files and replace original one with a symlink
- fix current working directory getter
