Correct project filenames for case-sensitive filesystems

Fix build on linux by removing post-build 'copy' step
Allow legacy mode to:

a. Extract addons that violate the whitelist
b. Extract addons without requiring write privileges
Merge pull request #10 from t-richards/linux-legacy-fixes
Fixed accidental changes making the project unbuildable
Misc, documentation
Followup to #10: turn the whitelist back on after override