TerrainMapper 0.4.1 updates

Compatibility with Terrain Mapper 0.4.1.
Update Polish translation. Thanks @Lioheart! Closes #184. Update Brazilian Portugese translation. Thanks @Kharmans!
Fix for terrain cost measuring in pixel units instead of grid units for gridless maps.
Fix pathfinding failing for users once the preview token stops moving. Closes #138.

What's Changed

• v0.10.3 by @Kharmans in #182

Full Changelog: 0.10.3...0.10.4