Add support for language that doesn't use bracket to fold -> Like LUA

[FooPhoenix]

LUA doesn't use bracket to fold. Here some examples :

function test()
    -- some code
end

for k,v in pairs(a) do
    -- some code
end

if true then
    -- some code
end

while true do
    -- some code
end

It woulds be great to have a support for LUA in your extension :)
(Note : other languages like Bash doesn't use bracket to fold too)