KE2: Move the context stack from LoggerBase to Logger

This will let us have different threads with their own contexts that
share a LoggerBase.

java/kotlin-extractor2/src/main/kotlin/KotlinExtractor.kt

@@ -500,15 +500,6 @@ OLD: KE1
     logger.info("Extracting file $srcFilePath")
     logger.flush()
 
-/*
-OLD: KE1
-    val context = logger.loggerBase.extractorContextStack
-    if (!context.empty()) {
-        logger.warn("Extractor context was not empty. It thought:")
-        context.clear()
-    }
-*/
-
     val srcFileRelativePath = PathTransformer.std().fileAsDatabaseString(File(srcFilePath))
 
     val dbSrcFilePath =  FileUtil.appendAbsolutePath(dbSrcDir, srcFileRelativePath).toPath()

java/kotlin-extractor2/src/main/kotlin/utils/Logger.kt

@@ -113,11 +113,6 @@ data class ExtractorContext(
  * else will use a Logger that wraps it (and the DiagnosticTrapWriter).
  */
 open class LoggerBase(val diagnosticCounter: DiagnosticCounter) {
-/*
-OLD: KE1
-    val extractorContextStack = Stack<ExtractorContext>()
-*/
-
     private val verbosity: Int
 
     init {
@@ -325,6 +320,11 @@ OLD: KE1
  * Logger is the high-level interface for writint log messages.
  */
 open class Logger(val loggerBase: LoggerBase, val dtw: DiagnosticTrapWriter) {
+/*
+OLD: KE1
+    val extractorContextStack = Stack<ExtractorContext>()
+*/
+
     fun flush() {
         dtw.flush()
         loggerBase.flush()