add developer section
Merge branch 'master' of https://github.com/guwirth/sonar-cxx
Support variadic macros.
Support GCC's Conditionals with Omitted Operands.

There is a GCC extension which allows the middle operand in a conditional
expression to be omitted. Therefore, the expression "x ? : y" has the value of x
if that is nonzero; otherwise, the value of y.
Support GCC's Conditionals with Omitted Operands #138
Mark the rule change as extension
skip declaration errors
- disable parsing error checks, todo: write new tests
- todo: add error message in AST
- handle error recovery on global declaration level: skip syntax errors and proceed with next declaration
- add CC file to test declaration syntax errors
- add new property to enable/disable error recovery: sonar.cxx.errorRecoveryEnabled=true/false
repair ParsingErrorCheckTest (with errorRecoveryEnabled = false)
add syntax error logging
Merge branch 'feature/recovery-from-parsing-errors' of https://github.com/guwirth/sonar-cxx into feature/recovery-from-parsing-errors