Add static method support to methodmaps.

sourcepawn/compiler/tests/fail-call-non-static-on-type.sp

@@ -0,0 +1,12 @@
+native printnum(t);
+
+methodmap X
+{
+	public int GetThing() {
+		return 10;
+	}
+}
+
+public main() {
+	printnum(X.GetThing());
+}

sourcepawn/compiler/tests/fail-call-non-static-on-type.txt

@@ -0,0 +1 @@
+(11) : error 176: non-static method or property 'GetThing' must be called with a value of type 'X'

sourcepawn/compiler/tests/fail-call-static-via-instance.sp

@@ -0,0 +1,13 @@
+native printnum(t);
+
+methodmap X
+{
+	public static int GetThing() {
+		return 10;
+	}
+}
+
+public main() {
+	X x;
+	printnum(x.GetThing());
+}

sourcepawn/compiler/tests/fail-call-static-via-instance.txt

@@ -0,0 +1 @@
+(12) : error 177: static method 'GetThing' must be invoked via its type (try 'X.GetThing')

sourcepawn/compiler/tests/ok-call-static-method.sp

@@ -0,0 +1,12 @@
+native printnum(t);
+
+methodmap X
+{
+	public static int GetThing() {
+		return 10;
+	}
+}
+
+public main() {
+	printnum(X.GetThing());
+}