Kexi/Porting to Qt&KF 5

Draft. Each step leads to compiling (running?) state. Stered by jstaniek (talk) 19:06, 7 July 2014 (CET).

1. Port Predicate lib to Qt 5
2. Move koproperty lib to a separate repo, make it Qt-only and port to Qt5
3. Move koreport lib to a separate repo, make it Qt-only and port to Qt 5
   1. Remove scripting or port scripting?
4. Port Kexi (without KexiDB, reporting, KoReport) to Qt 5 and port Kexi to Predicate and the new koproperty/koreport
   1. Porting report scripting to a simple QtScript solution to keep backward compatibility with Kexi 2
   2. Remove then unused calligradb lib and parts of kexidb lib
5. Improve Kexi stability after porting
6. -- Kexi 3.0 release here --
7. Make koreport lib dependent on Predicate and remove code/API that becomes redundant (e.g. KoReportData)
8. Add a new QtScript-based scripting module
9. Use the module in Kexi Reports too, keeping backward compatibility with Kexi 2 scripting