allow tool path overrides via concore.tools config and env vars #277
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tool paths (g++, iverilog, python3, matlab, octave) can now be overridden via:
concore.toolsconfig file (KEY=value format)priority: config file > env var > hardcoded default
defaults unchanged (g++, iverilog, python3, matlab, octave) so existing setups keep working
added 6 tests for the config parser
updated README with config docs
fixes #247