Cppcheck should only be invoked with a single configuration

### Environment

* Operating System (e.g. Ubuntu 16.04 x64): Windows 10
* IDE Version (e.g. CLion 2016.3.2): Clion 2020.1 (201.6668.86)
* Cppcheck executable version (`cppcheck --version`): 1.90
* Cppcheck plugin version: 1.4.2

### Expected behaviour

The inspections show issues in active code only.

### Actual behaviour

The inspection may should code in non-active (i.e. `_MSC_VER` although GCC is being used) blocks.

If Cppcheck is invoked with just a source file it tries to detect and process all configuration (i.e. defines) in the source. In case of the IDE it should only do a scan for that current configuration. This requires the plugin to get this from the IDE (if possible) and provide it to the call.