SpringApplicationBuilder has to be careful not to overwrite the
default initializers if user calls its initializers() method.

Fixes gh-120.

Fixes gh-117.

Fixes gh-119.

Refactor spring-boot-loader to work directly with low level zip data
structures, removing the need to read every byte when the application
loads.

This change was initially driven by the desire to improve tab-completion
time when working with the Spring CLI tool. Local tests show CLI
startup time improving from ~0.7 to ~0.22 seconds.

Startup times for regular Spring Boot applications are also improved,
for example, the tomcat sample application now starts 0.5 seconds
faster.

If the server port is 0 it doesn't mean you don't want *any* container
because there might still be servlet context aware components in the
classpath. Better to try and stop the server from actually starting.

This change is a step in the right direction: it prevents the server
from starting in the start() method (even though for technical reasons
it may have already been started and stopped in initialize()).

N.B. Tomcat at least uses port=0 as a signal it should pick a random
port. Pertty useful feature that we may want to capitalize on at some
point (on the other hand having our own port scanner would be useful
generally too).

Refactor bash shell completion to move the majority of the logic into
the Java code. This commit also removes the need for the '--' prefix on
every command.

Add Spring-Boot-Commit-Id to MANIFEST.MF of spring-boot-loader-tools.
The reinstates functionality of 498ca076
but does not cause issues in eclipse.

Switch to placeholders in conditional expressions; Ensure that Crsh auto configuration works without Spring Security

Update the auto-configuration report to improve log formatting and to
separate the internal report data-structure from the JSON friendly
endpoint data-structure.

Update OnBeanCondition and OnClassCondition to improve the message used
on a successful match.

With the goal of making AetherGrapeEngine generally useful with Groovy,
this commit removes any Boot specifics from it. Specifically, there
is now only a single default repository: Maven Central. The
Boot-specific Spring milestone and snapshot repositories are now added
via @GrabResolver annotations that are added using an ASTTransformation.

As part of this change, AetherGrapeEngine has also been updated to store
its repositories using a LinkedHashSet, this ensures that the same
repository is not used more than once while maintaining their ordering.

Groovy's Grape allows a user to enable download reports using the
system property groovy.grape.report.downloads. This commit updates
AetherGrapeEngine to honour this property and produce a detailed
download report when the system property is set to true. In the
absence of the system property, or when it's set to a value other than
true, the existing summary report is still produced.

[bs-344]
[60145094]

@GrabExclude can now be used to exclude certain transitive dependencies.
In Aether (Maven), exclusions are applied to an individual dependency
rather than being global. In Grape, exclusions are global.
AetherGrapeEngine adheres to the Grape convention by applying every
exclusion create by @GrabExclude to every dependency, effectively making
them global.