minor optimisation: cache not equal predicate in constant
add unit tests for (package) protected implicite mapper method
renamed package noguava to implicitemappermethod + shorten class names
add equals and hashcode to model classes (except DASourceClass)
add unit test for impliciteMapperMethod in Enum mappers

add filtering of methods creating for the compiler on enums (valueOf() and values()) when building the SourceClass
move guava related unit tests in mapper-enum package to a guava subpackage
improve error report when java.tgt file does not exist

now we get an explicite message that the java.tgt file is missing with its name instead of a non explicite NPE
add support for enum Mapper with any mapper value name

remove hardcoded INSTANCE constant in MapperFactoryClassSourceGenerator