Hotfix 0.9.4.4b

[h3]Bugfixes:[/h3]

• Fixed crash on reloading corrupted skilltree from save file
  
• Fixed a bug that caused map difficulty (delve count) to not be set correctly resulting in too low enemy hp scaling. Now on each start the delve count is updated and correctly set to the amount of already finished maps.
  
• Fixed skills not updading their stack count accurately