updated gitignore, adding a math library

lib/math.pla

@@ -0,0 +1,19 @@
+pi = Func(): Float {
+	return 3.141592653589793;
+}
+
+e = Func(): Float {
+  return 2.718281828459045;
+}
+
+rad = Func(degrees: Float): Float {
+	return degrees * $pi() / 180;
+}
+
+deg = Func(radians: Float): Float {
+	return 180 * radians / $pi();
+}
+
+sqrt = Func(n: Float): Float {
+	return $pow(n, 0.5);
+}