lualoader: Add a loaded hook for others to execute upon config load

This will not be executed on reload, though later work could allow for that.
It's intended/expected that later work won't generally need to happen on
every config load, just once (for, e.g., menu initialization) or just when
config is reloaded but not upon the initial load.

stand/lua/config.lua

@@ -458,7 +458,7 @@ function config.selectKernel(kernel)
 	config.kernel_selected = kernel
 end
 
-function config.load(file)
+function config.load(file, reloading)
 	if not file then
 		file = "/boot/defaults/loader.conf"
 	end
@@ -485,13 +485,16 @@ function config.load(file)
 	config.module_path = loader.getenv("module_path")
 	local verbose = loader.getenv("verbose_loading") or "no"
 	config.verbose = verbose:lower() == "yes"
+	if not reloading then
+		hook.runAll("config.loaded")
+	end
 end
 
 -- Reload configuration
 function config.reload(file)
 	modules = {}
 	restoreEnv()
-	config.load(file)
+	config.load(file, true)
 	hook.runAll("config.reloaded")
 end
 
@@ -512,5 +515,6 @@ function config.loadelf()
 	end
 end
 
+hook.registerType("config.loaded")
 hook.registerType("config.reloaded")
 return config