Item types, activities carcass, qa tools

[TemirkhanN]

Feature:

• Introduced item types. Currently consumables have an impact. Currency is also for tracking if item is sellable.
• Acitivities are generalized. Since they work in the same manner, all they need is the reward data filled in data/activity_option.yaml
• Hunting system enhanced. Now we issue rewards for each slain mob and can track that info(planning to add some related quests). Some bugs fixed.

Tech:

• Added static code analyzer(phpstan. helps to find bugs earlier).
• Codesniffer (phpcs. just to ensure that the codebase looks the same)
• A few additional tests. Coverage around 50% at this point.
• Some refactoring performed according introduced tools.