[Quality of life] Be able to use a key (mouse 3 ?) to select the block the player is pointing

[Elanis]

When pointing a specific block and pressing this specific key, auto-switch the block in hand to the pointing one.
This would make building easier/faster

[ArthurVasseur]

Also, add Enter key (from the numpad) to submit messages in the chat.

[SirLynix]

Also, add Enter key (from the numpad) to submit messages in the chat.

This one is already implemented on dev