Zoltan wk7 progress

tasks done:

1. save player inventory
2. save player name
3. save player gender //defaults to male
4. checkpoint system

new script: SaveCheckpointScript.cs (should be attached to checkpoint
signs to save
progress, checkpoint needs starter value!!!)

5. load checkpoint after death
6. save actual HUB state to DataStore

files effected:

datastore.cs
pickupscript.cs
textdisplayscript.cs
uiscript.cs
inventory.cs
door.cs
HealthScript.cs
changeSprites.cs