m2m rom.asm

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Use callback functions to implement core-specific logic, file search filters, etc.

Describe how to use tool functions provided by the framework starting with M2M$...

Use the C64 core as an example to walk through some use cases

Shell memory layout: Also describe how to change the balance between "more files in the file browser" vs. "larger OSM" and other memory decisions that the framework user can make and link to Shell memory layout

Add a section that explains the most important fatal messages of the framework, particularly those which have something to do with errors in config.vhd or too large menu and then the necessity to change the heap balance