* spellbook shows adventure spells when opened on adventure map
* removed redundant quotation marks from skills description
* erasing path after picking objects with last movement point
* support for 3 new artifacts:
- Ring of Vitality
- Ring of Life
- Vial of Lifeblood
* restructures creature ability preparing (creature abilities are now loaded from cr_abils.txt file). It needs further work - all changes in abilities should be moved from CCreatureHandler.cpp to cr_abils.txt as it's done in this commit (I hope it's clear how it should be done as there is an example)
* version set to 0.72
* integrated save format version to the CLoadFile
* fixed problems on entering non-number as resolution number
* minor improvements
* Mines / Resource Silos won't give income in the first turn
* Double click on hero slot during stack splitting won't crash
* Fixed problems with updating buttons / minimap
