Improve optimization of cast chains of literals over short/byte.
Unbreak enums over bytes
Add __release_mode, use it to turn assert()s into no-ops.
Add "type-is static-array T".
Minor stuff.
std.lib.glfw3 now depends on 3.0.3.
Something with hashmaps and SDL, possibly repairing a previous incomplete commit.
Add std.unicode.atIndex.