Fix data type promotions to mimic C++

Actually in C++ `unsigned int + int` gives an `unsigned int` which is not very
intuitive

src/language/ASTNodeDataType.hpp

@@ -8,8 +8,8 @@ enum class ASTNodeDataType : int32_t
 {
   undefined_t    = -1,
   bool_t         = 0,
-  unsigned_int_t = 1,
-  int_t          = 2,
+  int_t          = 1,
+  unsigned_int_t = 2,
   double_t       = 3,
   string_t       = 5,
   typename_t     = 10,

tests/test_ASTNodeDataType.cpp

@@ -25,7 +25,8 @@ TEST_CASE("ASTNodeDataType", "[language]")
     REQUIRE(dataTypePromotion(ASTNodeDataType::double_t, ASTNodeDataType::bool_t) == ASTNodeDataType::double_t);
     REQUIRE(dataTypePromotion(ASTNodeDataType::double_t, ASTNodeDataType::unsigned_int_t) == ASTNodeDataType::double_t);
     REQUIRE(dataTypePromotion(ASTNodeDataType::double_t, ASTNodeDataType::int_t) == ASTNodeDataType::double_t);
-    REQUIRE(dataTypePromotion(ASTNodeDataType::int_t, ASTNodeDataType::unsigned_int_t) == ASTNodeDataType::int_t);
+    REQUIRE(dataTypePromotion(ASTNodeDataType::int_t, ASTNodeDataType::unsigned_int_t) ==
+            ASTNodeDataType::unsigned_int_t);
     REQUIRE(dataTypePromotion(ASTNodeDataType::int_t, ASTNodeDataType::bool_t) == ASTNodeDataType::int_t);
     REQUIRE(dataTypePromotion(ASTNodeDataType::unsigned_int_t, ASTNodeDataType::bool_t) ==
             ASTNodeDataType::unsigned_int_t);