Fix Eagle/Fusion crash when a design rule param is missing or duplicated

[DominikPalo]

FusionEagleParser._parse_param_length reads the rlMinViaOuter and mlViaStopLimit design rule params. It is meant to log a warning and fall back to a default when a param is missing, or to use the first occurrence when it is listed more than once. Both paths called self.logger.warning(...), but the project's ibom.Logger wrapper only defines info, error and warn (warn is what the other 11 call sites in the repo use). Instead of warning, both cases crashed:

AttributeError: 'Logger' object has no attribute 'warning'

This affects any .brd/.fbrd whose design rules don't include those params, e.g. older or hand-edited files and some exports.

This change switches both calls to self.logger.warn(...). I did this instead of adding a warning alias to Logger to keep the logger API as it is.

Testing

Ran the CLI (generate_interactive_bom in CLI mode, which uses ibom.Logger(cli=True)) on three Eagle test boards:

Board	master	this PR
Both params present	BOM generated	BOM generated (unchanged)
Both params missing	AttributeError traceback	WARNING rlMinViaOuter not found, defaulting to 0, same for mlViaStopLimit, BOM generated
rlMinViaOuter listed twice	AttributeError traceback	WARNING Multiple rlMinViaOuter found, using first occurrence, BOM generated

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