Fix class Javadoc
Move AMF0 encoding specific classes to separate package
Introduce new decoding class and package, add additional constants and a new utility class.
Rename class to closer reflect its purpose.
Add Findbugs overrides for null handling tests
Update AMF0Constants class to not use mutable static scope arrays and instead use a defensive copy method.
Add support for UTF8 decoding
Add additional decoding support
Add additional unit tests
Update unit tests for AMFPreconditions to test for valid values.