INT-3422: Add `ChannelInterceptorAware.remove()`

JIRA: https://jira.spring.io/browse/INT-3422

* Add two methods:
```
boolean removeInterceptor(ChannelInterceptor interceptor);
boolean removeInterceptor(int index);
```

The method `removeInterceptorsOfType(Class<?> clazz)` isn't good, because we lead undesired behavior, when several provided interceptors might be of the same type (e.g. by superclass)

INT-3422: PR comments
INT-3488: Map `Content-Disposition` HTTP header

JIRA: https://jira.spring.io/browse/INT-3488

The `Transfer-Encoding` has been remained as unmapped for the `DefaultHttpHeaderMapper.inboundMapper()`
INT-2791 temp-channel-transacted for AMQP Channel

JIRA: https://jira.spring.io/browse/INT-2791

* Add `template-channel-transacted` attribute for the `<amqp:channel>`s to separate configuration for
container and RabbitTemplate
* Make container's `channelTransacted` as `false` by default
* Upgrade to `S-AMQP-1.4.0`
* Add `AmqpHeaders.PUBLISH_CONFIRM_NACK_CAUSE` according to the new `RabbitTemplate.ConfirmCallback#confirm` signature

Conflicts:
	src/reference/docbook/whats-new.xml

Conflicts:
	src/reference/docbook/whats-new.xml

INT-2791: Polishing

Upgrade to S-AMQP-2.0

Fix for mock publisher confirm/return tests, since `channel` is now physically closed, if the `ConnectionFactory` isn't `CachingConnectionFactory`
INT-3499 AMQP Confirms/Returns Polishing

JIRA: https://jira.spring.io/browse/INT-3499

- Suppress expected exception from log in test case
- Suppress (log) 'null' payload error when no correlation data
- Enforce a specific amqp template reference in the parser when using confirms/returns
- Change tests to use a dedicated template for confirms/returns
INT-3402 ChannelNames lazy-resolution Refactoring

JIRA: https://jira.spring.io/browse/INT-3402

After applying introduction of `AbstractMessageProducingHandler` there was need some simply refactoring to follow with DRY
INT-3427: Add `JsonNodeToStringConverter`

JIRA: https://jira.spring.io/browse/INT-3427

INT-3427: Workaround for String -> File converter

INT-3427: PR comments
INT-3486: Poller: Prevent Interrupt StackTrace

JIRA: https://jira.spring.io/browse/INT-3486

INT-3486a: PR comments
INT-3370: Add `BoonJsonObjectMapper`

JIRA: https://jira.spring.io/browse/INT-3370

* Add `BoonJsonObjectMapper`
* Provide some tests
* Remove deprecations
* Polishing test according removed deprecations
* Change `JsonObjectMapper#populateJavaTypes` to get deal with `payload`, not its `class`,
since we can't (and Jackson's `TypeFactory`, too) determine generic type from `Collection`.
Use `iterators` instead to retrieve the type from the first item.

Conflicts:
	build.gradle
	spring-integration-amqp/src/test/java/org/springframework/integration/amqp/support/DefaultAmqpHeaderMapperTests.java

INT-3370: Polishing according PR comments

* Apply Gary's polishing to the Docs
* Fix `RecipientListRouter` JavaDoc warn
* Fix typo in test name for `UdpUnicastEndToEndTests`
* Fix `RedisQueueOutboundChannelAdapterTests` do not use Jackson 1.x

Final Polish
INT-3489 Reschedule Aggregator's group-timeout

JIRA: https://jira.spring.io/browse/INT-3489

* Catch `MessageDeliveryException` and reschedule `group-time out task`: `AbstractCorrelatingMessageHandler#scheduleGroupToForceComplete`
* Apply `send-timeout` for the `discardChannel`
* Mark `groupRemove = false` in case of `MessageDeliveryException`
* Improve `send-timeout` docs

INT-3489: Recalculate `groupTimeout` on each rescheduling

Add Test for Zero Timeout
INT-3402-3: Channels Late Resolution #3

JIRA: https://jira.spring.io/browse/INT-3402

* Add late resolution of channel names for the `MessagingGatewaySupport`
* Implement delegate logic for internal implementations like `ContentEnricher.Gateway`
Fix Tests SPR 4.1 Compatibility

GenericMessage.toString() changes.
INT-3492: Deprecate `@Payload` and `@Header(s)`

JIRA: https://jira.spring.io/browse/INT-3492

Since `@Paylod` and `@Header(s)` annotations are in the Spring Framework,
there is no more need to support them in Spring Integration.

Deprecate them and leave for backward compatibility.
Will be removed in future releases.

Remove deprecated Gatewa's `#method` expression evaluation context variable

Tested `gradlew clean testall` with and without changed to the tests.

INT-3492: Add `MessagingAnnotationUtils#findMassagePartAnnotation`

Move `MessagingAnnotationUtils` to the `org.springframework.integration.util` package
Fix JavaMail Dependency

`ImapMessage` has a direct dependency on `ReadableMime`. It is
not clear why this started failing only on the MJATS41 build
but changing the `mailapi` dependency to `compile` fixes it
(tested by pointing the plan to my repo).