[v1.1.0] Mobile Input Support and Keybind Tutorial

New Neander-Z update!

Other than these two features, here's what else has changed: (Feature, Improvement, Bugfix)

1. Changed shotguns precision calculation to mark a shot as hit if at least one of it's ballins hit the target, instead of old calculation where each ballin had it's own value, aiming to make the players feel more rewarded using shotguns and prevent low acuracy even hitting the enemies.
2. Fixed weapon at the store with the label "Purchased" even after selling it.
3. Implemented a color change and blinking animation to the grenade trajectory preview  when the item has a "Cook fuse timeout", to warn the players it's about to explode in their hands!
4. Added new bark sounds to the enemy Robert when it spawns. Watch out!
5. Fixed visual glitch where a cluster of enemies would change the order that each enemy appear (z-index).
6. Fixed a bug where the enemy Raimundo would have his helmet damaged even shooting at the body.