Don't use $ in package fragment class names

Package fragment classes now are named "*Package-<filename>-<hash>" instead of
"*Package$src$<filename>$<hash>". This will help to avoid erroneous code in
intellij FileManager, which assumes that classes with dollars are always inner
classes of some other class (see AnnotationDescriptorDeserializer)

idea/testData/debugger/multiFileNamespace/a.kt

@@ -1,5 +1,5 @@
 package test
 
 fun foo() {
-    ""   // test/TestPackage$src$a$
+    ""   // test/TestPackage-a-
 }

idea/testData/debugger/multiFileNamespace/b.kt

@@ -1,5 +1,5 @@
 package test
 
 fun bar() {
-    foo();   // test/TestPackage$src$b$
+    foo();   // test/TestPackage-b-
 }