HttpString: HttpString values (part 1): initial case sensitive/insensitive API split
HttpString: HttpString values (part 2): comparators
HttpString: HttpString values (part 3): primary implementation
HttpString: Eliminate some field accesses
HttpString: add fromString() method
HttpString: Eagerly initialize bytes
HttpString: Fix missing write back to field
HttpString: some API enhancements
HttpString: fix and enhance region-matching methods, add raw access mechanism
HttpString: startsWith/endsWith
HttpString: more starts/endsWith, concat
HttpString: Migration of HttpExchange fields to HttpString (part 1)