Add a "new" keyword for constructing nullable methodmaps.

sourcepawn/compiler/tests/fail-new-with-no-constructor.sp

@@ -0,0 +1,10 @@
+methodmap Handle __nullable__
+{
+	public native ~Handle();
+};
+
+public t()
+{
+	Handle egg = new Handle();
+	delete egg;
+}

sourcepawn/compiler/tests/fail-new-with-no-constructor.txt

@@ -0,0 +1 @@
+(8) : error 172: methodmap 'Handle' does not have a constructor

sourcepawn/compiler/tests/fail-new-with-no-methodmap.sp

@@ -0,0 +1,13 @@
+methodmap Handle __nullable__
+{
+	public native Handle();
+	public native ~Handle();
+};
+
+enum Crab {};
+
+public t()
+{
+	Crab egg = new Crab();
+	delete egg;
+}

sourcepawn/compiler/tests/fail-new-with-no-methodmap.txt

@@ -0,0 +1 @@
+(11) : error 116: no methodmap or class was found for Crab

sourcepawn/compiler/tests/fail-new-with-non-nullable.sp

@@ -0,0 +1,11 @@
+methodmap Handle
+{
+	public native Handle();
+	public native ~Handle();
+};
+
+public t()
+{
+	Handle egg = new Handle();
+	delete egg;
+}

sourcepawn/compiler/tests/fail-new-with-non-nullable.txt

@@ -0,0 +1 @@
+(9) : error 171: cannot use 'new' with non-object-like methodmap 'Handle'

sourcepawn/compiler/tests/fail-nullable-needs-new.sp

@@ -0,0 +1,11 @@
+methodmap Handle __nullable__
+{
+	public native Handle();
+	public native ~Handle();
+};
+
+public t()
+{
+	Handle egg = Handle();
+	delete egg;
+}

sourcepawn/compiler/tests/fail-nullable-needs-new.txt

@@ -0,0 +1 @@
+(9) : error 170: creating new object 'Handle' requires using 'new' before its constructor

sourcepawn/compiler/tests/ok-new-with-nullable-methodmap.sp

@@ -0,0 +1,15 @@
+native void printnum(int num);
+
+methodmap Handle __nullable__
+{
+	public Handle() {
+		return Handle:2;
+	}
+	public native ~Handle();
+};
+
+public main()
+{
+	Handle egg = new Handle();
+	printnum(_:egg);
+}