Update code for updated stdlib

Updated to Factorio 0.16

Updated to Factorio 0.16

Merge pull request #10 from credomane/fixissues

fixes issues #4, #6, #7, #8 and #9.

Added Factorio 0.14 support

Fixed adding FactorioMaps to an existing save

Fixed incorrect parent button style.

add new line at eof of locale

convert spaces to tabs to match original code style

Version bump to 0.5.7.

Merge PR #1: multiplayer compatibility

Thanks for the assist, @YPetremann!