Fixes, Mac and Linux builds

Hi folks,

So today brings us a few fixes and the tentative Mac and Linux builds for those of you who use those operating systems.
If you have a Mac or are running Linux on your machine, please test the new builds and let me know if you find any issues.
If you run the game and the resolution is wonky under these new builds, please switch to windowed mode and then back to fullscreen mode using your Operating System's relevant keyboard shortcut.

There's also a few new Steam achievements and more will come.
A short summary of the patch is the following:

- All towns should be clickable on the map now
- Fixed behavior on some local and Steam achievements
- New Steam achievements
- F1-F12 now work as hotkeys for the tabs in game (population, buildings, research, etc.)
- The effect of the Relic of Endless Coins has been changed
- Other various minor fixes
- Various behavior improvements for better game stability