SVN_SILENT made messages (.desktop file)
stringhelpers: Remove duplicated code
Navigation: Make enumerator types show up properly

oldcpp marks enumerators as instances, not sure if this is correct. In
this case, enumerators show up just fine because kind ==
Declaration::Instance is true.

Making this fail-safe by explicitly allowing declarations of type
EnumeratorType to visit this branch.
JSON tests for ConstantIntegralType::plainValue
jsontypetests: Update doc
Navigation: Display enumerator value in tooltip
No value in ConstantIntegralType::toString

Use ConstantIntegralType::valueAsString (just renamed) instead to get
the actual value. This allows better formatting of the navigation
tooltip.
Remove pointless branch in navigation tooltip

This could only lead to "Modifiers: ", which is somewhat useless