Closes gh-5415

Closes gh-5335

See gh-5335

Previously, only dependency management for logback-classic was
provided. This meant that it was possible for logback-core, upon
which logback-classic depends, to have a different version.

This commit adds dependency management for logback-core, thereby
ensuring that the two dependencies will have the same version.

Closes gh-5304

Shutdown handling has been improved so that it will run after any
EntityManagerFactory beans have been closed. This ensures that Hibernate
can, if configured to do so, drop its schema during restart processing.
Without this change, a benign exception could be logged if the database
was shutdown before Hibernate.

Closes gh-5305

See gh-5258

State is accumulating unnecessarily in AST tranformation instances.
We can fix the ones we have implemented so far just by using a
local variable and passing it into the methods where it is used.
All the methods are private so this change is safe in a point release.

Fixes gh-5283

Previously, Animal Sniffer checking of spring-boot-loader-tools
was disabled as it failed with an NPE. This has been fixed in
Animal Sniffer 1.15.

This commit upgrades Animal Sniffer to 1.15 and adds the necessary
annotations to suppress failures for safe usage of sun.* and Java 7
APIs.

Note that UsesUnsafeJava has been copied from spring-boot and made
package-private. This retains the clearer intent of the custom
annotation (versus @IgnoreJRERequirement) while avoiding the change
in the build order that would be necessary for
spring-boot-loader-tools to use the annotation from spring-boot.

Closes gh-5284

Closes gh-5274

Previously, if DataSourceAutoConfiguration had been explicitly excluded,
DevToolsDataSourceAutoConfiguration would cause refresh to fail due to
a missing DataSourceProperties bean. This commit corrects the condition
so that the auto-configuration is conditional on a DataSource bean and
a DataSourceProperties bean rather than only being conditional on one or
the other.

Closes gh-5269

* gh-5205:
  Fix namespace declarations in Hazelcast xml's and make them consistent

If a JCache provider is started with hazelcast and the default settings,
the underlying `HazelcastInstance` is disposed at the end of the
process, not when the `CacheManager` is closed.

This commit fixes the only test that use such setup.

See also https://github.com/hazelcast/hazelcast/issues/7606

Closes gh-5209

 - Code formatting
 - Javadoc warnings
 - Deprecation warnings

Upgrade to Jetty 9.2.15 and replace use of API that was deprecated
and changed to throw an UnsupportedOperationException in the same
release.

Closes gh-5218

Closes gh-5212

Closes gh-5224

Closes gh-5223

Closes gh-5222

Closes gh-5221

Closes gh-5220

Closes gh-5219

Closes gh-5217

Closes gh-5216

Closes gh-5215

Closes gh-5214

Closes gh-5213

Closes gh-5211

This commit allows to customize the auto-configured `CacheManager` by
exposing a bean of type `CacheManagerCustomizer`. The implementation may
reference the type of a `CacheManager` to determine in which case it has
to be invoked.

Several implementations can be provided and ordered using the regular
`Ordered` interface and `@Order` annotation.

Closes gh-5039

Previously, if endpoints.enabled was false setting
endpoints.docs.enabled=true or endpoints.actuator.enabled=true would
have no effect as their entire configuration class was conditional
on endpoints.enabled being true.

This commit updates the conditions on the configuration class so that
it is conditional on either the actuator or docs endpoint being enabled.

Closes gh-5007

* gh-5032:
  Fix logic for disabling plugins in CrshAutoConfiguration

Plugin disabling logic was broken by e009d3e4. Prior to this change,
a plugin would be disabled if it or any of the implemented interfaces
in its inheritance hierarchy were configured as being disabled. The
offending commit inverted the logic so that the plugin would be
enabled if any part of it was NOT configured as being disabled.

This commit restores the logic such that the early return happens only
in the negative case.

Previously, the tests were written as though
PluginContext#getPlugin(Class) would consider the specified class
against the runtime type of the plugin (not an unreasonable
assumption); rather this method considers the broader 'plugin type'.
This commit rewrites the test to seek by plugin type and assert the
absence of the disabled plugins.

Closes gh-5032