2. TtlDelegate backing property unification

2. ttl Delegate
3. ttl callable extensions

- protect for NPE in method isAutoWrapper
    - add UT for getting unboxing boolean from map
- rename method/var: setAutoWrapper -> setAutoWrapperAttachment

should unwrap ttl runnable for before/afterExecute methods of executor subclass
when decorate by ttl agent

- expose isDisableInheritableForThreadPool/isEnableTimerTask
- improve test for DisableInheritableForThreadPool

disable Inheritable feature by using InheritableThreadLocal
can avoid potential leaking problem described in #100

add assert:
current thread's TTL must be exist when using DisableInheritableThreadFactory

- add DisableInheritableThreadFactory wrapper in TtlExecutors
- add Inheritable unit test

java agent start and process when app boot,
it is difficult to use (java.util.logging)JUL correctly 😩;
especially cooperate with app server(eg tomcat or jboss).

use simply std out/error instead of JUL.

more info see #97