* IncrementalCompiler IC object now holds the actual logic to start incremental compilation (rather than AggresiveCompiler or other)
* MixedAnalyzingCompiler ONLY does anlaysis of Java/Scala code
* Moved the AnalyzingJavaCompiler into the integration library so that necessary dependencies are visible.
* Split Java analyzing compile into its own class.
* MixedAnalyzingCompiler now only does the mixing
* Start moving methods around to more-final locations
* Static analyzingCompile method now constructs a MixedAnalyzingCOmpiler and delegates to incremental compile.
* Force CompileSetup Equiv typeclass to use Equiv relations defined locally.
* Add toString methods on many of the incremental compiler datatypes.
* Remove remaining binary compatibility issues in Defaults.scala.
* Move error parser into its own file.
* Add the ability to parse Windows filenames.
* Remove existence check for the file as a mandatory.
* Add specific test for the parser.
* Create a new sbt.compiler.javac package
* Create new interfaces to control running `javac` and `javadoc` whether forked or local.
* Ensure new interfaces make use of `xsbti.Reporter`.
* Create new method on `xsbti.compiler.JavaCompiler` which takes a `xsbti.Reporter`
* Create a new mechanism to parse (more accurately) Warnings + Errors, to distinguish the two.
* Ensure older xsbti.Compiler implementations still succeed via catcing NoSuchMethodError.
* Feed new toolchain through sbt.actions.Compiler API via dirty hackery until we can break things in sbt 1.0
* Added a set of unit tests for parsing errors from Javac/Javadoc
* Added a new integration test for hidden compilerReporter key, including testing threading of javac reports.
Fixes#875, Fixes#1542, Related #1178 could be looked into/cleaned up.
Ideally, we wouldn't need to construct the classpath ourselves and instead
reuse the classpath construction code from a compiler (scalac or javac).
However, we need to ensure that we only call the compiler when needed.
Because we need to construct the classpath even when compilation might
not happen, we have to duplicate classpath construction.