[Lua][Improvement] Consider processing all init.lua before other scripts

[deflinhec]

Shouldn't init.lua been processed before all other scripts?

Asscending depth order of folder structure and priority to init.lua before other script.

[deflinhec]

I'm running a project which contain an api folder, all dependecy have been handled and server starts without complains. After I deleted the api folder, some of the global variable and global functions are now missing, which affect to other modules.

Current the compling order will look like this.

1. class.agent
2. class.init
3. class.table
4. game.agent
5. game.init
6. game.table
7. init

It should be like this, in case of breaking the dependency between.

1. init
2. class.init
3. game.init
4. class.agent
5. class.table
6. game.agent
7. game.table

[deflinhec]

I could provide a PR if needed.