Support Factorio 0.18 (as version 0.5.0)

Fix error in info.json

Fix yet another save issue. Closes #15.

Update to version 0.4.5

Fix yet another on-save-init issue, since the previous guard against …

…it apparently no longer works.

Util.get_blueprint could be called with a nil itemstack in some circu…

…mstances, which would cause it to fail. It now returns nil in this case.

Fixes an issue with migrating the GUI and doing initial setup for it.

seriously, not at this hour.

Fix crash on loading a save that had an old version of Blueprint Exte…

…nsions.

Add thumbnail

Fix issues regarding initializing blueprint mirroring buttons.

Fix issues regarding initializing blueprint mirroring buttons.