sharedconfig: add support for sharedstate callback

sharedconfig.lua

@@ -10,12 +10,13 @@ local defaults_table
 --none is stored
 ---@param key string Key
 ---@param value any Value
-local function add_default_value(key, value)
+---@param callback? function Callback on value change
+local function add_default_value(key, value, callback)
 	defaults_table=defaults_table or {}
 	defaults_table[key]=value
 
 	local stored_value=config:load(key)
-	sharedstate.init(key, value)
+	sharedstate.init(key, value, callback)
 
 	if stored_value ~= nil then
 		sharedstate.queue(key, stored_value)
@@ -24,11 +25,14 @@ end
 
 --- Initialize sharedconfig
 -- Initialize shared config with default configuration
----@param defaults table
-function sharedconfig.load_defaults(defaults)
+---@param defaults table Table containing default values
+---@param callbacks? table Table containing callbacks to run on value change
+function sharedconfig.load_defaults(defaults, callbacks)
 	logging.trace("sharedconfig.load_defaults", defaults)
 	for k, v in pairs(defaults) do
-		add_default_value(k, v)
+		local callback=nil
+		if callbacks ~= nil and callbacks[k] ~= nil then callback=callbacks[k] end
+		add_default_value(k, v, callback)
 	end
 	sharedstate.commit()
 end