RFE: Retain configurable number of mekhq / megamek / megameklab log files

[mjbroekman]

Description

Currently, there are only one of each mekhq, megamek, and megameklab log file. This can cause issues if the game needs to be restarted for some reason and you fail to copy the logs to a new location first.

Enhancement

Much like the maximum number of autosave files, add an option to configure the number of old log files. On startup, the programs would check for an existing log file and, if found, it would rename the previous log files before writing the new (current) log file.

[neoancient]

That's a good idea.

[sixlettervariables]

Likely just a settings change via https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/RollingFileAppender.html