Rework for loops to use iterators, requiring pairs or ipairs function to handle multi-assignment

UpsilonTests/GeneralTests/ForLoopTests.cs

@@ -85,7 +85,7 @@ return a
             const string input = @"
 arr = {100, 56, 28}
 value = 0
-for key, val in arr do
+for key, val in ipairs(arr) do
     value = value + val
 end
 return value
@@ -103,7 +103,7 @@ return value
             const string input = @"
 arr = {100, 56, 28}
 value = 0
-for key, val in arr do
+for key, val in ipairs(arr) do
     local keyInt = tonumber(key)
     value = value + keyInt
 end

UpsilonTests/GeneralTests/FunctionTests.cs

@@ -206,7 +206,7 @@ end
             const string input = @"
 arr = {100, 56, 28}
 value = 0
-for key, val in arr do
+for key, val in ipairs(arr) do
     value = value + tonumber(key)
 end
 return value

UpsilonTests/GeneralTests/ScopeTests.cs

@@ -51,7 +51,7 @@ b = a
             const string input = @"
 arr = {100, 56, 28}
 local value = 0
-for key, val in arr do
+for key, val in ipairs(arr) do
     value = value + val
 end
 return value