Add support of changes generation. Changes will be generated (unless explicitly asked not to) automatically during check process (i.e. `repo-update --dry-run` and aliases) and uploaded to the remote server. Changes can be reviewed either by web interface or by special subcommands.
Changes will be automatically cleared during next successful build
* implement log storage at backend
* handle process id during removal. During one process we can write logs from different packages in different times (e.g. check and update later) and we would like to store all logs belong to the same process
* set package context in main functions
* implement logs support in interface
* filter out logs posting http logs
* add timestamp to log records
* hide getting logs under reporter permission
List of breaking changes:
* `ahriman.core.lazy_logging.LazyLogging` has been renamed to `ahriman.core.log.LazyLogging`
* `ahriman.core.configuration.Configuration.from_path` does not have `quiet` attribute now
* `ahriman.core.configuration.Configuration` class does not have `load_logging` method now
* `ahriman.core.status.client.Client.load` requires `report` argument now
this also requires to move default configuration files to share/ahriman.
Thus the following features have been added
* default configuration is not stored in /usr/share/ahriman/settings
* package installed via PKGBUILD now copies files from /usr
* configuration class now fallbacks to default in /usr
