RBBI Rule Size Reductions

Some ideas for reducing the size of break iterator rule files

• Use bytes rather than 16 bit values in the state table, when a byte is enough. Which it is for our standard rule types. (The ICU 60 line break table is 59 char classes by 171 states, a possible 10kB savings)

• Remove fluff from the stored rule string. Remove extra spaces, unescape \u escaped non-syntax characters in the rules. Possibly store as UTF-8.

• Markus is considering a byte-valued Trie table, which again would be enough for our standard break types.