Refactor debugger tests

1. Move tests to their own module
2. Avoid sharing the 'tinyApp' project between tests
3. Clean up option directive handling

idea/jvm-debugger/jvm-debugger-test/testData/stepping/custom/stepIntoStdlibInlineFun2step.kt

@@ -1,3 +1,4 @@
+// FILE: stepIntoStdlibInlineFun2step.kt
 package stepIntoStdlibInlineFun2step
 
 fun main(args: Array<String>) {
@@ -5,4 +6,15 @@ fun main(args: Array<String>) {
 }
 
 // ADDITIONAL_BREAKPOINT: functionInLibrary.kt:public inline fun simpleFun()
-// STEP_INTO: 5
+// STEP_INTO: 5
+
+// FILE: customLib/functionInLibrary/functionInLibrary.kt
+package customLib.functionInLibrary
+
+public inline fun simpleFun() {
+    nextFun()
+}
+
+public inline fun nextFun() {
+    val a = 1
+}