Code completion support

[SmileYik]

At this stage, writing Lua code for this plugin presents some challenges, as it requires simultaneously writing Lua while searching for Javadoc references.

If code completion could be implemented in some way to assist with coding, the experience would be significantly improved.

[SmileYik]

Java source file convert to code completion step files:

https://github.com/SmileYik/LuaInMinecraftBukkitII-LLS-Generator

Lua type mark addon:

https://github.com/SmileYik/LuaInMinecraftBukkitII-LLS-Addon