Demo update

Demo version has been updated to v1.0-alpha, and this will probably be the final demo version before full release. Content has stayed mostly the same, but there are a number of QoL changes and improvements:

• Multiple save files

• Reworked settings screen

• Reworked party screen for easier swaps

• Steam achievements (5 are obtainable in the demo)

• More tutorials on TP and other early game mechanics

• Starter tech tweaks and buffs

• Tenn (the TV forest man) can now heal your party