For loop might remove local variable

[XmiliaH]

In case the iteration variable of a loop shadows a variable in the outer scope it will be removed due to the use of undeclareVariable as seen in

local i=3
for i=1,1 do
end
print(i)

Instead add a new scope for the iteration variables preventing shadowed variables from being removed.

The undeclareVariable and undeclareVariables methods are now unused and could be removed.