Items and inventory based on #254

[nicemicro]

It has been a long time since #254 has been PR'd, so I tried to merge the main branch into it, so we can proceed.

[github-actions[bot]]

HOW TO REVIEW:

• Test multiplayer (client and host)
• Check build status
• Check UI
• Check the code
• Check build artifacts

[zapzoop0099]

The game is acutally working fine and debug messages are also nice. But i have found a loophole in the system pretty easy to be fixed but important.Actually using this loophole player can pick up or to be more precise drag 2 items in one place. How to reproduce:-

• Hold any item
• Go near to another item
• And start spamming the "E" key and run in any direction

Using this a player can easily drag two items at once place.This was also present in the Base PR. It can be easily fixed by changing the rate at which the player can pick up item

[nicemicro]

Multiple things are addressed, including @zapzoop0099 's concerns for the abusability of repeated dast pick up and drop of items. The item highlighting has been revamped, now the item you can pick up with the "E" key is highlighted in green, others that you can select by the mouse are highlighted in yellow.

[nicemicro]

apart from the merge conflict, the infiltrator can kill, pick up an item, reload(while holding the item), and kill again(while holding the item)

Thanks for the in depth testing, guess this will require a little more in-depth rewrite of some parts, I'll get be back to it as soon as possible.