major code rewriting
* migrate from stdlib to qt as much as possible
* fix bug with proccessing srts with multiple-line subtitle texts
* get rid of move semantics (they make code ugly)
* get rid of namespace Subs
* migrate from Subs::Time to QTime
* make the main window larger
* don't use 'auto' when it's not clear what the type is
* add -Wall compiler flag for debug builds
* rewrite unit tests in Boost.Test & drop CppUnit dependency
* don't use Boost in the actual code (only in unit tests)

... and some things I don't remember or care about