Demo Update - v0.1.3

Several changes, some smaller, some larger :)

• Changed Town upgrade system to use orb shards instead of specific orbs, making it easier to acquire the required upgrade costs

• Rebalanced several levels and trinkets

• Added more display options for finer control of performance adjustments

• Added possibility to sell orbs in the shop

• Added button remapping (controller support is still tbd...)

• Added a leaderboard, tracking the quickest demo game win.

• Changed level loading for smoother gameplay experience (sadly some hiccups still exist, will investigate further...)

• Several smaller Bugfixes