Adds blinding + blindfolds (#8688)

* Adds blinding + blindfolds

* Don't break examining lol

* moment

* fix toggle lights behavior

* move checks around

* Sloth review

* Added a salvage funny

* review

* woops

* Switch circle shader

Co-authored-by: wrexbe <wrexbe@protonmail.com>

Resources/Textures/Shaders/greyscale_fullscreen.swsl

@@ -0,0 +1,9 @@
+uniform sampler2D SCREEN_TEXTURE;
+
+void fragment() {
+    highp vec4 color = zTextureSpec(SCREEN_TEXTURE, UV);
+
+    highp float grey = dot(color.rgb, vec3(0.299, 0.587, 0.114));
+
+    COLOR = vec4(vec3(grey), color.a);
+}