Movement fixes + improvements / Tiny DroppedItem changes

[Col-E]

Whats Changed:

• Walking up stairs is smoothed, no longer instantly teleports you up each block
• Dropped items stack size only shows in debug mode
• Dropped items now become non-solid when near the player
  • This allows you to pick up nearby objects through walls like in Terraria

Whats Fixed:

• You can no longer spiderpig across the ceiling.
• You can now move in tight spaces.
• If you somehow manage to get stuck, you will get squeezed free.

Bloopers:

I messed up these movement fixes a bunch of times. Here's a few of them:

• "Physics are optional"
• "Boing"
• "Who needs wall collision? Not me!"

[Col-E]

Do not merge yet. A few more things need fixing.

Edit: As of c959c71: Feel free to merge

[egordorichev]

Big thanks! Movement is always triky ;) One thing i found in changed files, is that the spawn command description tells: "spawns in an entity". Thats totaly fine, but the code ask Enemies class to do that. Probably, Enemies should becomd creatures and handle CreatureWithAI. Thats my error. Sorry. Will update that system, when will be back.

[Col-E]

Movement sure is a real pain to get just right. Spent pretty much all day trying to fix these bugs. But now I can finally close https://github.com/egordorichev/LastTry/issues/75

[Col-E]

The one disappointing thing is that the fix makes going up steps kinda jarring now. The easy solution would be to have a camera that lags a little bit behind and moves into position rather than constantly being perfectly centered at the player. Kinda like a sonic the hedgehog game.

This better solution will be way more painful. Look at how Terraria's looks.

[egordorichev]

That can be done easily. Camera moves werid because of int / floats.

[Col-E]

The issue is the camera modification is the easy fix. An even better movement implementation would be the best option.

[Col-E]

Working on smoothing out motion while keeping the fixes in place.

Smoothing is working out nice, but now I can't move in tight places anymore. Looking for a compromise.

Edit: Got smoothing and kept the fixes in place vs. current non-smooth step

[egordorichev]

Finaly, i'm here!