PVP area, consumable item changes and minor fixes

Update to version dev - 2.1.2. Here is an excerpt of the most important changes:

  • PVP area was added to the game, allowing players to kill each other. A warning message is displayed, when the user tries to enter that area
  • eating food/drinking or using a consumable is now time-limited action, and will be taking place instead of attack, when in combat
  • navbar icons were changed, although rework of navbar is not yet fully done...
  • icons were added to the minimap