lua: rename Plugin() to Plugin.find()

Plugin() is confusing because it's not a constructor, it just finds
an existing instance of a plugin object. All other camel-case
functions are constructors in the current lua API.

modules/module-lua-scripting/api.c

@@ -278,6 +278,11 @@ plugin_find (lua_State *L)
   return 1;
 }
 
+static const luaL_Reg plugin_funcs[] = {
+  { "find", plugin_find },
+  { NULL, NULL }
+};
+
 /* WpObject */
 
 static void
@@ -1253,8 +1258,8 @@ wp_lua_scripting_api_init (lua_State *L)
   luaL_newlib (L, core_funcs);
   lua_setglobal (L, "WpCore");
 
-  lua_pushcfunction (L, plugin_find);
-  lua_setglobal (L, "WpPlugin_find");
+  luaL_newlib (L, plugin_funcs);
+  lua_setglobal (L, "WpPlugin");
 
   wp_lua_scripting_pod_init (L);
 

modules/module-lua-scripting/api.lua

@@ -144,7 +144,7 @@ SANDBOX_EXPORT = {
   GLib = GLib,
   Log = WpLog,
   Core = WpCore,
-  Plugin = WpPlugin_find,
+  Plugin = WpPlugin,
   ObjectManager = WpObjectManager_new,
   Interest = WpObjectInterest_new,
   SessionItem = WpSessionItem_new,