misc: mark constructors as explicit

misc: mark constructors as explicit

Set 218 constructors as explicit to avoid implicit usage.

Fix for cppcheck warning:
 Class has a constructor with 1 argument that is
 not explicit. Such constructors should in general be explicit for
 type safety reasons. Using the explicit keyword in the constructor
 means some mistakes when using the class can be avoided.

 For more information check:
  https://www.codeproject.com/Articles/28663/Explicit-Constructor-in-C

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>