Tweaking values to Meteor Gamemode

- Meteor waves should now be a lot stronger
- Meteor events buffed seriously
- Surviving in meteor gamemode is still fairly possible, but you are now
more likely to fall victim to them if you don't set up defenses and stay
reactive
Fixing typo
Merge pull request #1348 from dylanstrategie/Meteor

Tweaking values to Meteor Gamemode