fixed call position of showing and hiding of loading screen
attempted to fix level prefab section misactivate bug, updated mini boss prefabs to only drop powerups
Merge branch 'develop' into JackySprint9

Conflicts:
	UnityProject/Assets/Resources/Prefabs/PreloadedPrefab/Level/TutorialLevel.prefab
	UnityProject/Assets/Scenes/GameStart.unity
updated tutorial level prefab
Merge pull request #60 from jackykschou/JackySprint9

Jacky sprint9