Properly handle format analysis

Rename ATTRIBUTE_PRINTF to
- ID_STATIC_ATTRIBUTE_PRINTF
- ID_INSTANCE_ATTRIBUTE_PRINTF
since for instance functions, this has to be taken into account, too.
Add format analysis to idLib, DeclManager and idTokenParser functions.
Add support for clang.
Add format analysis to format functions in Common.
Merge pull request #79 from abergmeier/add_format_analysis

Properly handle format analysis