Compression of schedule logs by custom FirstSpirit log4j appender "FSAppender"

Dear e-Spirit product responsibles,

according to the FirstSpirit central server log files that are being compressed by default, it would be kind to have a compression feature available for the:

- logs being created in the <fs_install_dir>/log/schedule


Currently, this is not the case. For sure, it has to be guaranteed that when compressing the log files there is a need to uncompress them when loading them in the FirstSpirit ServerManager within the schedule overview again.