Polish Gradle 4.7 release notes

Mention immutable startParameter

Merge pull request gradle#4899 from gradle/eriwen/docs/kotlin-dsl-not…

…es-take-2

Expand on pre-compiled script plugins in 4.7 release notes

Fix link to Java Library Plugin docs from release notes

Rework release notes around dependency management.

Includes changes in sample code and userguide to align them.

Merge pull request gradle#4397 from gradle/oehme/failfast/clean-output

Stop forwarding if a process closed its streams

Restore build scope script class cache

This cache was useful when a script was applied
multiple times during a build. It avoids checking
the hash of the script again, as we can safely
assume that a build script will not change during
a single build.

Polish docs design a little

Bump to latest nightly release snapshot

Reorder some content in build environment chapter

Signed-off-by: Eric Wendelin <[email protected]>