Added incremental cache format versioning.

jps-plugin/testData/incremental/custom/cacheVersionChangedAndFileModified/a.kt

@@ -0,0 +1,4 @@
+package test
+
+fun f() {
+}

jps-plugin/testData/incremental/custom/cacheVersionChangedAndFileModified/b.kt

@@ -0,0 +1,4 @@
+package test
+
+fun g() {
+}

jps-plugin/testData/incremental/custom/cacheVersionChangedAndFileModified/b.kt.new

@@ -0,0 +1,4 @@
+package test
+
+fun g() {
+}

jps-plugin/testData/incremental/custom/cacheVersionChangedAndFileModified/build.log

@@ -0,0 +1,11 @@
+Cleaning output files:
+out/production/module/test/TestPackage$b$*.class
+out/production/module/test/TestPackage.class
+End of files
+Cleaning output files:
+out/production/module/test/TestPackage$a$*.class
+End of files
+Compiling files:
+src/a.kt
+src/b.kt
+End of files