Change lua_pushnumber to lua_pushinteger for non floating point values

[xmish]

Pull Request Prelude

• I have followed proper The Forgotten Server code styling.
• I have read and understood the contribution guidelines before making this PR.
• I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

Replace some lua_pushnumber with lua_pushinteger to fix display of some integer values in game.
I'm not sure if it's a valid approach and also I'm not sure about changes in:

• setField
• LuaScriptInterface::registerVariable

Issues addressed:
#4522

[ranisalt]

Sorry missclicked

[EvilHero90]

needs a rebase

[ranisalt]

@EvilHero90 we can't merge this right now because it implies dropping LuaJIT support, but we can do it for the next release cycle

[EvilHero90]

@EvilHero90 we can't merge this right now because it implies dropping LuaJIT support, but we can do it for the next release cycle

There was no intention to push this immediatly, I just want to see if this gets worked on or not