Debugger: Rework expression evaluator.

CLanguageExpressionEvaluator:
- Revise to make use of Number class rather than MAPM. In the process,
  implement support for bitwise operators.

SourceLanguage/CLanguageFamily/CLanguageExpressionEvaluator:
- Adjust interface for expression evaluation to allow specifying the
  type to evaluate the expression as. Adjust implementing classes
  accordingly.

ExpressionEvaluationWindow:
- Adjust to new expression interface. For now defaults to 64-bit integer
  type, UI for type selection to be added.

src/apps/debugger/source_language/SourceLanguage.cpp

@@ -30,7 +30,7 @@ SourceLanguage::ParseTypeExpression(const BString& expression,
 
 status_t
 SourceLanguage::EvaluateExpression(const BString& expression,
-	Value*& _resultValue)
+	type_code type, Value*& _resultValue)
 {
 	return B_NOT_SUPPORTED;
 }