Closes gh-3194

Closes gh-3192

Closes gh-3189

Closes gh-3188

Closes gh-3187

Closes gh-3186

Closes gh-3185

Closes gh-3184

Closes gh-3183

Closes gh-3182

Closes gh-3180

Closes gh-3179

Closes gh-3176

Closes gh-3191

Closes gh-3190

Review 105039cd that still refer to "lifecycle" instead of "admin". In
particular, harmonized the configuration properties.

Closes gh-3124

If the `repackage` goal defines an output directory that does not exist,
the maven plugin now creates it.

Closes gh-3136

Fixes gh-3168

Remove explicit TestFailedException catch in CommandRunner and instead
rely on the fact that TestFailedException extends CommandException.

Fixes gh-3167

Rename SpringApplicationLifecycle JMX beans to SpringApplicationAdmin
and relocate to a dedicated package.

Fixes gh-3124

Fixes gh-3162

Closes gh-3159

The build currently fails intermittently when an external container,
usually TomEE or Wildfly, fails to start within the default timeout
period of two minutes. This commit updates the timeout to 5 minutes for
all containers (Tomcat, TomEE and Wildfly) in the hope that it will
help to stabilise the CI build.

See gh-3086

Closes gh-3122

Support loading a `.spring-boot-devtools.properties` file from the
users home folder. The property file can be used to customize settings
that make sense on a per-user basis, but might not want to be checked
into the project.

Fixes gh-3151

Allow the pollInterval and the quietPeriod of the filewatcher to be
configured.

Fixes gh-3139

Update `FileSystemWatcher` to support the concept of a "trigger file"
which could be written by an IDE when a reload needs to occur.

Fixes gh-3157