BIP103 to 30MB

If you use this formula, with a decaying percentage, it takes about 100 years to get to 30MB, but never goes past that.

Since it never passes 32, we don't have to worry about going past that ever... unless another hard fork is done. A schedule like this could allow block size to scale with tech growth asymptotically. Might be nice to include with other things

P=17%, Pn = P*0.95 X = 1, Xn = X * (1+P)