Improved Formatting and base class handling

• Formatting fixed for code blocks.
• Rendering of parameter list fixed. Occurred twice, once without formatting.
• Fixed rendering of class with multiple bases where some were not found in current dOxygen scope.
• Repeat method brief description in front of detailed description for functions. Use brief in overview, brief+detailed in detailed view.
• Added rendering of enclosed types struct A { using B=int; }; (see test/templated-base)