Also allow '#menu:' as keyword instead of '#!' in input.conf

Apparently lua patterns don't have syntax which does (#!|#menu:), so it is split with the if statement

README.md

@@ -379,7 +379,7 @@ Adding items to menu is facilitated by commenting your keybinds in `input.conf`
 
 Comment has to be at the end of the line with the binding.
 
-Comment has to start with `#!`.
+Comment has to start with `#!` (or `#menu:`).
 
 Text after `#!` is an item title.
 

uosc.lua

@@ -2825,6 +2825,9 @@ state.context_menu_items = (function()
 
 	for line in io.lines(input_conf_path) do
 		local key, command, title = string.match(line, '%s*([%S]+)%s+(.*)%s#!%s*(.*)')
+		if not key then
+			key, command, title = string.match(line, '%s*([%S]+)%s+(.*)%s#menu:%s*(.*)')
+		end
 		if key then
 			local is_dummy = key:sub(1, 1) == '#'
 			local submenu_id = ''