add(colours): Ports matrix/colormate stuff from CHOMP

Original PR: https://github.com/CHOMPStation2/CHOMPStation2/pull/6159
Original Author:
https://github.com/BlackMajor

code/datums/interfaces/appearance.dm

@@ -0,0 +1,143 @@
+/**
+ * hey, remember mutable appearance?
+ *
+ * only:
+ * - this isn't a real object rather than a struct
+ * - i'm making a cast for it so we can VV it
+ * - this is also used to cast procs that operate on appearance-like things.
+ *
+ * Sue me, I need to debug things somehow
+ *
+ * DO NOT USE THESE UNLESS YOU KNOW WHAT YOU ARE DOING.
+ */
+/appearance
+	var/alpha
+	var/appearance_flags
+	var/blend_mode
+	var/color
+	var/desc
+	var/dir
+	var/gender
+	var/icon
+	var/icon_state
+	var/invisibility
+	var/infra_luminosity
+	var/list/filters
+	var/layer
+	var/luminosity
+	var/maptext
+	var/maptext_width
+	var/maptext_height
+	var/maptext_x
+	var/maptext_y
+	var/mouse_over_pointer
+	var/mouse_drag_pointer
+	var/mouse_drop_pointer
+	var/mouse_drop_zone
+	var/mouse_opacity
+	var/name
+	var/opacity
+	var/list/overlays
+	var/override
+	var/pixel_x
+	var/pixel_y
+	var/pixel_w
+	var/pixel_z
+	var/plane
+	var/render_source
+	var/render_target
+	var/suffix
+	var/text
+	var/transform
+	var/list/underlays
+	// var/vis_flags
+
+//! vis_flags missing even though byond ref says it's there, fuck off why is this possible
+
+GLOBAL_REAL_VAR(_appearance_var_list) = list(
+	"alpha",
+	"appearance_flags",
+	"blend_mode",
+	"color",
+	"desc",
+	"dir",
+	"gender",
+	"icon",
+	"icon_state",
+	"invisibility",
+	"infra_luminosity",
+	"filters",
+	"layer",
+	"luminosity",
+	"maptext",
+	"maptext_width",
+	"maptext_height",
+	"maptext_x",
+	"maptext_y",
+	"mouse_over_pointer",
+	"mouse_drag_pointer",
+	"mouse_drop_pointer",
+	"mouse_drop_zone",
+	"mouse_opacity",
+	"name",
+	"opacity",
+	"overlays",
+	"override",
+	"pixel_x",
+	"pixel_y",
+	"pixel_w",
+	"pixel_z",
+	"plane",
+	"render_source",
+	"render_target",
+	"suffix",
+	"text",
+	"transform",
+	"underlays"
+	// "vis_flags"
+)
+
+/proc/__appearance_v_debug(appearance/A, name)
+	switch(name)
+#define DEBUG_APPEARANCE_VAR(n) if(#n) return debug_variable(name, A.n, 0, null)
+		DEBUG_APPEARANCE_VAR(alpha)
+		DEBUG_APPEARANCE_VAR(appearance_flags)
+		DEBUG_APPEARANCE_VAR(blend_mode)
+		DEBUG_APPEARANCE_VAR(color)
+		DEBUG_APPEARANCE_VAR(desc)
+		DEBUG_APPEARANCE_VAR(dir)
+		DEBUG_APPEARANCE_VAR(gender)
+		DEBUG_APPEARANCE_VAR(icon)
+		DEBUG_APPEARANCE_VAR(icon_state)
+		DEBUG_APPEARANCE_VAR(invisibility)
+		DEBUG_APPEARANCE_VAR(infra_luminosity)
+		DEBUG_APPEARANCE_VAR(filters)
+		DEBUG_APPEARANCE_VAR(layer)
+		DEBUG_APPEARANCE_VAR(luminosity)
+		DEBUG_APPEARANCE_VAR(maptext)
+		DEBUG_APPEARANCE_VAR(maptext_width)
+		DEBUG_APPEARANCE_VAR(maptext_height)
+		DEBUG_APPEARANCE_VAR(maptext_x)
+		DEBUG_APPEARANCE_VAR(maptext_y)
+		DEBUG_APPEARANCE_VAR(mouse_over_pointer)
+		DEBUG_APPEARANCE_VAR(mouse_drag_pointer)
+		DEBUG_APPEARANCE_VAR(mouse_drop_pointer)
+		DEBUG_APPEARANCE_VAR(mouse_drop_zone)
+		DEBUG_APPEARANCE_VAR(mouse_opacity)
+		DEBUG_APPEARANCE_VAR(name)
+		DEBUG_APPEARANCE_VAR(opacity)
+		DEBUG_APPEARANCE_VAR(overlays)
+		DEBUG_APPEARANCE_VAR(override)
+		DEBUG_APPEARANCE_VAR(pixel_x)
+		DEBUG_APPEARANCE_VAR(pixel_y)
+		DEBUG_APPEARANCE_VAR(pixel_w)
+		DEBUG_APPEARANCE_VAR(pixel_z)
+		DEBUG_APPEARANCE_VAR(plane)
+		DEBUG_APPEARANCE_VAR(render_source)
+		DEBUG_APPEARANCE_VAR(render_target)
+		DEBUG_APPEARANCE_VAR(suffix)
+		DEBUG_APPEARANCE_VAR(text)
+		DEBUG_APPEARANCE_VAR(transform)
+		DEBUG_APPEARANCE_VAR(underlays)
+		// DEBUG_APPEARANCE_VAR(vis_flags)
+#undef DEBUG_APPEARANCE_VAR