Three issues addressed here:
1. Dependency on dictionary iteration order
CharacterProperties.swift.gyb iterated a dictionary to produce its output.
Changed this to a list of tuples to ensure the order is predictable.
2. Python3 `map` returns an iterator, not a list
Changed a bunch of `map` calls to `list(map(...))` to ensure the result is a list
3. Python3 `int()` expects a string, won't accept a list of characters
Added a concatenation step that is effectively a no-op on Python2
Sequence benchmarks that test operations on Arrays have setup overhead of 14 μs. (Up from 4 μs a year ago!) That’s just the creation of an [Int] with 2k elements from a range… This array is now extracted into a constant.
This commit also removes the .unstable tag from some CountableRange benchmarks, restoring them back to commit set of the Swift Benchmark Suite.
