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Make GlobalTracer uses more threadsafe (#269)

* Make GlobalTracer uses more threadsafe

As discussed in #186 replace `void register(Tracer)` with a more
atomic `boolean registerIfAbsent(Tracer)` method.

* Throw NPE (with message) for registerIfAbsent(null) calls

* Add '@Deprecated' annotation + replace nested if by '&&'.

* Remove registerIfAbsent(Tracer) as unwanted duplicate

* Replace TracerSupplier interface with Callable<Tracer>

* Document thrown exceptions

* Combine javadoc for checked + unchecked exceptions from provider

* Wording for rethrown exceptions from provider

* Add brackets around 'if' statement

* Add unit tests for registerIfAbsent + restore tests for register methods

* Clarify wording used in unit test

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292 of 394 relevant lines covered (74.11%)

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