Change computed properties to inline assignments
Change computed properties to inline assignments

As per @adamnemecek in PR #5, inlining these static properties makes
things quite a bit cleaner. I've also employed his idea of removing the
type before the .max property access. I had to continue to use a var
type to allow them to be lazily loaded. I also removed the redundant
UInt128 type specification on the max and min properties, as I'm clearly
using a UInt128 initializer in the inlined statement.

Jitsusama/UInt128,Jitsusama/UInt128