lua add submenu module + cleanup

allows menus + submenus + context menus all with simple tables
menu_t which is a table of strings
func_t which are the corresponding functions to go with those strings

see lua_scripts/submenu_demo.lua

Change-Id: I907b74b4abef0ecbe49f181d0ced6e6d20e94de5

apps/plugins/lua/include_lua/menubuttons.lua

@@ -0,0 +1,28 @@
+
+local rbac_is_loaded = (package.loaded.actions ~= nil)
+require("actions")   -- Contains rb.actions & rb.contexts
+
+-- Menu Button definitions --
+local button_t = {
+    CANCEL = rb.actions.PLA_CANCEL,
+    DOWN = rb.actions.PLA_DOWN,
+    DOWNR = rb.actions.PLA_DOWN_REPEAT,
+    EXIT = rb.actions.PLA_EXIT,
+    LEFT = rb.actions.PLA_LEFT,
+    LEFTR = rb.actions.PLA_LEFT_REPEAT,
+    RIGHT = rb.actions.PLA_RIGHT,
+    RIGHTR = rb.actions.PLA_RIGHT_REPEAT,
+    SEL = rb.actions.PLA_SELECT,
+    SELREL = rb.actions.PLA_SELECT_REL,
+    SELR = rb.actions.PLA_SELECT_REPEAT,
+    UP = rb.actions.PLA_UP,
+    UPR = rb.actions.PLA_UP_REPEAT,
+}
+
+if not rbac_is_loaded then
+    rb.actions = nil
+    rb.contexts = nil
+    package.loaded.actionss = nil
+end
+
+return button_t