(Boost): replace boost use by C++17 new features

What does this MR do?

Replace usage of std versions of:

• boost::filesystem
• boost::make_unique
• boost::any
• boost::assign (most of them, some were left because of specific boost containers such as bimaps)

Also, fwQtTest failed a lot during testing, so a fix has been proposed. It should no longer fail now.

How to test it?

• Run unit-tests, applications, etc...

Associated Issues/Merge Requests

• Issues
  • Closes #382 (closed)