Adopting uniform style in args passing

[mexanick]

Description

• all arguments for exported methods are passed as const T&
• style convention: use const T& t instead of const T &t. Reason: eases the regex parsing
• const T& t are used instead of T const& t in order to avoid confusion

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Refactoring

Motivation and Context

Adresses #173

How Has This Been Tested?

The code compiles, functionality didn't change

Screenshots (if appropriate):

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[lpetre-ulb]

@mexanick, any chance you could fix the latest comments soon? My hope is for this PR to be the final one in develop in this repository.

[mexanick]

oh, thanks for reminder - I somehow missed your comments. Will fix soon