fix: fix issues

- restore some CKGlobals behavior because it will cause runtime exception.
- move some classes from CmdHelper to UnvirtContext to make CmdHelper more common to use.
- output warning string when fail to get utf8 or ordinary string.

Unvirt/CmdHelper.cpp

@@ -522,6 +522,11 @@ if (!this->IsRootNode()) { \
 
 #pragma region String Argument
 
+		StringArgument::StringArgument(const std::u8string_view& argname, Constraint_t constraint) :
+			AbstractArgument(argname), m_Constraint(constraint) {}
+
+		StringArgument::~StringArgument() {}
+
 		bool StringArgument::BeginConsume(const std::u8string& cur_cmd, ArgumentsMap& am) {
 			// check constraint
 			if (m_Constraint.IsValid() && !m_Constraint.m_CheckFct(cur_cmd))
@@ -531,23 +536,6 @@ if (!this->IsRootNode()) { \
 			return true;
 		}
 
-#pragma endregion
-
-#pragma region Encoding List Argument
-
-		bool EncodingListArgument::BeginConsume(const std::u8string& cur_cmd, ArgumentsMap& am) {
-			// split given argument
-			std::vector<std::u8string> encs = YYCC::StringHelper::Split(cur_cmd, u8",");
-			// check each parts is a valid encoding name
-			for (const auto& item : encs) {
-				if (!LibCmo::EncodingHelper::IsValidEncodingName(item))
-					return false;
-			}
-			// okey, add into map
-			am.Add<ArgValue_t>(m_ArgumentName, encs);
-			return true;
-		}
-
 #pragma endregion
 
 	}