Rewrite manifest.py to make including local changes safer (not very backwards compatible)
Rewrite manifest.py to make including local changes safer (not very backwards compatible)

UprootStaging/wpt-tools,kaixinjxq/wpt-tools,vivliostyle/wpt-tools,UprootStaging/wpt-tools,kaixinjxq/wpt-tools,kaixinjxq/wpt-tools,wpt-on-tv-tf/wpt-tools,frewsxcv/wpt-tools,frewsxcv/wpt-tools,vivliostyle/wpt-tools,frewsxcv/wpt-tools,UprootStaging/wpt-tools,wpt-on-tv-tf/wpt-tools,wpt-on-tv-tf/wpt-tools,vivliostyle/wpt-tools