[2 lines] fix blinding (#9690)

* 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>

* resolve merge conflict

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

Resources/Textures/Clothing/Eyes/Misc/blindfold.rsi/meta.json

@@ -0,0 +1,18 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "Taken from tgstation at https://github.com/tgstation/tgstation/commit/40d89d11ea4a5cb81d61dc1018b46f4e7d32c62a",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "icon"
+    },
+    {
+      "name": "equipped-EYES",
+      "directions": 4
+    }
+  ]
+}

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);
+}