Merge branch '1.0.x' into merge-1.0.x-into-1.x

* 1.0.x: (28 commits)
  Split compiler bridge tests to another subproject
  Implement compiler bridge for 2.13.0-M2
  Add yourkit acknoledgement in the README
  "sbt '++ 2.13.0-M2!' compile" does not work with sbt 1.0.0
  Add header to cached hashing spec
  Add headers to missing files
  Fix sbt#332: Add sbt-header back to the build
  Update sbt-scalafmt to 1.12
  Make classpath hashing more lightweight
  Fix sbt#442: Name hash of value class should include underlying type
  source-dependencies/value-class-underlying: fix test
  Ignore null in generic lambda tparams
  Improve and make scripted parallel
  Fix sbt#436: Remove annoying log4j scripted exception
  Fix sbt#127: Use `unexpanded` name instead of `name`
  Add pending test case for issue/127
  source-dependencies / patMat-scope workaround
  Fixes undercompilation on inheritance on same source
  Add real reproduction case for sbt/zinc#417
  Add trait-trait-212 for Scala 2.12.3
  ...

 Conflicts:
	internal/zinc-apiinfo/src/main/scala/sbt/internal/inc/ClassToAPI.scala
	project/build.properties
	zinc/src/main/scala/sbt/internal/inc/MixedAnalyzingCompiler.scala

The ClassToAPI conflict is due to:
* sbt/zinc#393 (a 1.x PR), conflicting with
* sbt/zinc#446 (a 1.0.x PR).

The build.properties conflict is due to different PRs bumping
sbt.version from 1.0.0 to 1.0.2 to 1.0.3. (sbt#413, sbt#418, sbt#453).

The MixedAnalyzingCompiler conflict is due to:
* sbt/zinc#427 (a 1.x PR), conflicting with
* sbt/zinc#452 (a 1.0.x PR).

internal/zinc-ivy-integration/src/main/scala/sbt/internal/inc/ZincComponentCompiler.scala

@@ -42,9 +42,12 @@ private[sbt] object ZincComponentCompiler {
     def compilerBridgeId(scalaVersion: String) = {
       // Defaults to bridge for 2.12 for Scala versions bigger than 2.12.x
       scalaVersion match {
-        case sc if (sc startsWith "2.10.") => "compiler-bridge_2.10"
-        case sc if (sc startsWith "2.11.") => "compiler-bridge_2.11"
-        case _                             => "compiler-bridge_2.12"
+        case sc if (sc startsWith "2.10.")     => "compiler-bridge_2.10"
+        case sc if (sc startsWith "2.11.")     => "compiler-bridge_2.11"
+        case sc if (sc startsWith "2.12.")     => "compiler-bridge_2.12"
+        case sc if (sc startsWith "2.13.0-M")  => "compiler-bridge_2.13.0-M2"
+        case sc if (sc startsWith "2.13.0-RC") => "compiler-bridge_2.13.0-M2"
+        case _                                 => "compiler-bridge_2.13"
       }
     }
     import xsbti.ArtifactInfo.SbtOrganization

internal/zinc-ivy-integration/src/test/scala/sbt/internal/inc/ZincComponentCompilerSpec.scala

@@ -11,6 +11,7 @@ class ZincComponentCompilerSpec extends BridgeProviderSpecification {
   val scala2121 = "2.12.1"
   val scala2122 = "2.12.2"
   val scala2123 = "2.12.3"
+  val scala2130M2 = "2.13.0-M2"
 
   val logger = ConsoleLogger()
   it should "compile the bridge for Scala 2.10.5 and 2.10.6" in {
@@ -28,4 +29,8 @@ class ZincComponentCompilerSpec extends BridgeProviderSpecification {
     IO.withTemporaryDirectory(t => getCompilerBridge(t, logger, scala2122) should exist)
     IO.withTemporaryDirectory(t => getCompilerBridge(t, logger, scala2123) should exist)
   }
+
+  it should "compile the bridge for Scala 2.13.0-M2" in {
+    IO.withTemporaryDirectory(t => getCompilerBridge(t, logger, scala2130M2) should exist)
+  }
 }