* fixed drawbacks in displaying secondary skills in hero window
* fixed two bugs with spellBook
* corrected order of spells in spellBook
* spellBook is opened when hero in battle is left-clicked
* spells learning
* no tooltips for objects under FoW
* working resource silo
* new system for simple unit abilities/states
* neutral monster army disappears when defeated
* synchronization between client and server processes
* fixed battle ending