util bar merge

See merge request !32

Mana and stamina.

See merge request !31

Improvements to attacks.

See merge request !30

- Now can take CharacterStats.
- Creates a new AttackStat instead of modifying this one.
- Throws exception if ran on an already calculated AttackStat.

- Checks crit and damage variance.

Updating master

See merge request !29

glømte å last opp xpbar og sceen

See merge request !28

Added simple xp bar

See merge request !27

Added second attack to player for testing.

See merge request !26

- Activate using the z key.

Ability rework.

See merge request !25