Move compiler scripting tests to scripting plugin, remove unused funs

also remove some tests that are covered in the scripting-compiler
tests now.
Part of the cleanup to rewrite scripting to the new infrastructure.

plugins/scripting/scripting-compiler/testData/compiler/fib_std.kts

@@ -0,0 +1,13 @@
+// Expecting two string parameters or nothing
+
+fun fib(n: Int): Int {
+    val v = if(n < 2) 1 else fib(n-1) + fib(n-2)
+    println("fib($n)=$v")
+    return v
+}
+
+val num = if (args.size > 0) java.lang.Integer.parseInt(args[0]) else 4
+val comment = if (args.size > 1) args[1] else "none"
+
+println("num: $num ($comment)")
+val result = fib(num)