Rebindable Hotkeys (#12138)

* demodularize interface

* keybindings

* binds

* prefs

* loose ends

* globals

* changes

* s

* datum ref lists

* ok

* fixes

* fixes

* fix

* ok

* sigh

* sigh

* indicators

* let's play the move code around game

* let's play the i didn't comma my lists game

* let's play the indent game

* let's play hte spelling bee

* let's fail the spelling bee

* LET'S PLAY THe HOW HARd  IS  IT TO SPELL A PROC GAME

* let's play the bugfix game

* bugfixes

* improvements

* Update bindings_client.dm

* pixel shift

* A

* wups

code/modules/keybindings/keybind/_keybind.dm

@@ -0,0 +1,24 @@
+/datum/keybinding
+	var/list/hotkey_keys
+	var/list/classic_keys
+	var/name
+	var/full_name
+	var/description = ""
+	var/category = CATEGORY_MISC
+	var/weight = WEIGHT_LOWEST
+	var/keybind_signal
+
+/datum/keybinding/New()
+
+	// Default keys to the master "hotkey_keys"
+	if(LAZYLEN(hotkey_keys) && !LAZYLEN(classic_keys))
+		classic_keys = hotkey_keys.Copy()
+
+/datum/keybinding/proc/down(client/user)
+    return FALSE
+
+/datum/keybinding/proc/up(client/user)
+	return FALSE
+
+/datum/keybinding/proc/can_use(client/user)
+	return TRUE