Partly support generics and nullable types as parameters for script templates

compiler/testData/script/array2d_param.kts

@@ -0,0 +1,4 @@
+val v: Array<in String> = param[0]
+val s = v[0]
+
+System.out.println("first: $s, size: ${v.size}")

compiler/testData/script/array_parameter.kts

@@ -0,0 +1,4 @@
+val v1 = myArgs[0]
+val v2 = myArgs[1]
+
+System.out.println("$v1 and $v2")

compiler/testData/script/nullable_parameter.kts

@@ -0,0 +1,4 @@
+import java.lang.RuntimeException
+
+val k: Int? = param
+if (k == null) System.out.println("Param is null") else throw RuntimeException("param is not null")

compiler/testData/script/nullable_projection.kts

@@ -0,0 +1,5 @@
+import java.lang.RuntimeException
+
+val v: String? = param[0]
+
+if (v == null) System.out.println("nullable") else RuntimeException("non nullable projection")

compiler/testData/script/variance_parameters.kts

@@ -0,0 +1,4 @@
+val v1 = param1[0].toString()
+val v2 = param2[0].toLong()
+
+System.out.println("$v1 and $v2")