Rethink when lava starts

[berithpy]

9/10 times you can't get past the first 15 seconds or so of the game because lava gets to you before opening the firsts doors or advancing enough horizontally.

[berithpy]

This issue has a lot of problems associated, some of the things we can do to mitigate it are:

• Start the lava timer after the first door or something similar.
• Use the patterns diffculty setting
• Add more low difficulty patterns

[berithpy]

If we delay the lava timer until someone opens the first door, or whatever we do to hold the lava back, it'll be nice to have an indicator for the lava, some kind of gauge that tells you the speed and how far is it or something equivalent. This has ties with #9