Add changelog
Support Visual C++ 2012

-  Remove `cdwf2::Command::Command(const QString &,
std::initializer_list<Command::Param>)` from API
-  Changes in README file
-  Some changes in that *ugly* install
-  Minor bugfixes
Added `common.pri` and changed API library name
Add header bar in Actor ui
Drop non-Windows platforms support
Some "ugly" install bugfixes
Rename Alpha 1.1 to Alpha 2
README improvements
Beep: add `freq` and `duration` parameters
Rename versions

`?.?.?-stage?` was replaced by `Stage?` format.
README corrections
Remove unused macros from API
Merge remote-tracking branch 'origin/development'