Add support for per-instance debug.log for 1.19.x

[ukmcplyr]

The Problem

The log4j config used by ATLauncher doesn't handle creating a traditional debug.log file.

The Solution

Using the installed log_configs/client-1.12.xml as a base, I've cobbled together a version now which works with modern Forge.

Doesn't appear to change current logging behaviour, new debug.log file aside, but I've not touched log4j before today so needs a more critical once over.

New config is here and requires only -Dlog4j.configurationFile=/path/to/log_configs/client-1.19.xml on the command line.

Additional Information

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