Fixes for 0.18

[jheyd]

Updated sprite filenames and set factorio_version in info.json to 0.18

Did not do extensive testing, but the game is able to start and I did not spot any obvious bugs ingame

[TheBB]

Typo. Should be alerts.

[jheyd]

fixed

[TheBB]

I also needed to add mip to the path for refresh.png.

[jheyd]

For some reason I retyped the things from my working / tested version instead of just copying the file and made two mistakes in the process. Sorry for that.

[0ptera]

I'll leave it to Eduran, if he returns, to merge these changes.
However I feel a pull request for the 0.10.x branch to Factorio 0.18 is redundant, after I already made an 0.18 branch from the 1.0 beta. I've been using 1.0 beta for 6 months now and it feels ready for release.

[TheBB]

@Yousei9 That branch depends on GUI_Modules. Can you clarify where a 0.18-ready version for that can be found?

[0ptera]

You will have to port the 0.17 version to 0.18 yourself.
If I recall correctly only the version in info.json needs to be updated.

[TheBB]

Thanks. Yeah that seems to work. I was confused earlier because the entry button had moved.