Exposed Lua script properties through inspector

[adriengivry]

Description

This PR exposes all public (non _ prefixed) members in a script's lua table.

Properties are "locked" by default, so that when the default value changes in Lua, it's not overridden by the value set in the inspector.

Example script used:

---@class oui : Behaviour
local oui =
{
    name = "",
    foo = 0,
    yes = false,
    _private = "You cannot see me!"
}

function oui:OnStart()
    Debug.Log("Hello " .. self.name .. "!")
end

function oui:OnUpdate(deltaTime)
end

return oui

To-Do

• Find a way to avoid serialization to override any future default value update in the script.

Related Issue(s)

Fixes #419

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Checklist

• My code follows the project's code style guidelines
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly
• My changes don't generate new warnings or errors