Implement female uniform masking.

Resources/Shaders/stencilclear.swsl

@@ -0,0 +1,3 @@
+void fragment() {
+    COLOR = vec4(0);
+}

Resources/Shaders/stencilmask.swsl

@@ -0,0 +1,7 @@
+void fragment() {
+    if (texture(TEXTURE, UV).a == 0) {
+        discard; // Discard if no alpha so that there's a hole in the stencil buffer.
+    }
+
+    COLOR = vec4(0);
+}