Tooling for PropertiesLauncher in JAR archives

To use PropertiesLauncher instead of JarLauncher in an
executable JAR we have provided tooling support. In Maven
(using the starter parent to default some of the settings):

    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
      <configuration>
        <layout>ZIP</layout>
      </configuration>
    </plugin>

in Gradle:

    apply plugin: "spring-boot"
    springBoot {
        layout = 'ZIP'
      }
    }

[Fixes #58837492] [bs-330] Add tooling for PropertiesLauncher
Add profiles to /env
Stop log4j from moaning on startup
Ensure JdbcTemplate and DB initializer still work when user supplies DataSource
Polish
Allow 'java -jar' to work with signed nested jars

Fix RandomAccessJarFile to correctly read certificate information as
jar entries are loaded. This change allows signed nested jars to be
used as JCE providers.
Update brew install instructions to use tap

Issue: gh-86
Remove Git plugin from Spring Boot tools

The Git plugin was primarily being used to provide version information
that Boot's maven plugin can add into the MANIFEST.MF of the uber-jars
that it creates under the Spring-Boot-Commit-Id attribute.

This commit removes the Git plugin from Boot's own projects, but
leaves it in the spring-boot-starter-parent for use by Spring
Boot-based applications.

The attribute in the uber-jars' MANIFEST.MF has been replaced with a
Spring-Boot-Version attribute. The value of this attribute is the
implementation version of Repackager class's package.
Move database files into target directory
Provide an Aether-based Grape Engine

Previously, @Grab annotations would use Ivy to download the
dependencies with some of Ivy's known limitations being worked around
by GrapeEngineCustomizer.

This commit adds a GrapeEngine implementation that uses Aether,
the dependency resolution 'engine' used by Maven and Grails. To ensure
consistent behaviour with a Maven build, the Aether-powered dependency
resolution uses the dependency management configuration from the
spring-boot-starter-parent pom file.
Isolate Aether in a separate class loader

Prior to this commit, the Aether-based GrapeEngine was loaded in the
same class loader as the rest of Boot. This led to Aether's and its
dependencies' types polluting the application's class path. Most
notably, this caused problems with logging as the logging framework
could be permaturely initialized.

This commit isolates AetherGrapeEngine, Aether and its dependencies
into a separate class loader. This is done by customizing the
packaging of the CLI's jar file with the internal directory housing
all of the types that will be loaded by the separate class loader.
Merge branch 'aether-grab'
Reinstate use of hasMappingForPattern

Use of hasMappingForPattern was commented out during work on the
Aether-based Grape implementation as it was temporarily removed in 
Spring 4's snapshots. It's since been reinstated in the snapshots, so
its use should have been reinstated prior to merging Aether work into
master.
Remove remaining git.properties files
Add simple DB aware HealthIndicator
Adjust db type if postgres
Use additional properties instead of default args

SpringApplication (and the builder) now do not accept default
command line args because the override semantics were wrong -
you need to be able to override them with everything, including
system properties and external properties (per profile).

Also implements new semantics for profiles - you can add
additional profiles in the Java API and they will not be
squashed by command line or system properties entries for
spring.profiles.active.

[Fixes #58989906] [bs-336] DefaultArgs -> DefaultProperties
Disable whitelabel view if Thymeleaf error.html detected
Ensure ClassLoader is set in BeanFactory
Support transitive=false in AetherGrapeEngine

@Grab allows a dependency to be declared, but for its transitive
dependencies to be excluded by setting transitive to false. This
commit enhances AetherGrapeEngine to honour this setting by using a
wildcard exclusion on any dependency so declared.