Pitch: Unicode Processing APIs

[YOCKOW]

I created a topic to discuss just Endianness(or ByteOrder) type rather than bike-shedding here.
For those who are interested in it,

Tiny Pitch: `ByteOrder` type

ByteOrder type Introduction You may often take endianness (or byte-order) into account when you get involved in, for example, stream programming. While network byte-order is defined as big endian, you may have to handle some other stream whose endian is unknown in advance. In such case, you want a type that identifies endianness to write code like if theStream.byteOrder == .littleEndian { ... }. Motivation CoreFoundation has a such type that represents endianness, and its related definitions lo…