Added class Obfuscator.SplitPoint which allows creating obfuscators that split obfuscation to two separate obfuscators.
Added method Obfuscator.fromFunction(ObfuscatorFunction) that works like Obfuscator.fromFunction(Function), but lets the function do the sub sequencing. This may lead to better performance.
Added method ObfuscatorUtils.lastIndexOf similar to ObfuscatorUtils.indexOf, to find the last occurrence of a character in a CharSequence range.