Refactored hitby to be in line with TG's version.
Refactored item weight defines to a more clear naming scheme, also in
line with TG's version.
Refactored how the movement bumps are handled, ported signals to handle
them, in preparation for the movement update.
Fixed disposal hit bouncing the hitting atom on the wall.
Items do not push other items anymore if they are tiny.
Adds a bit of what is related here: https://forums.aurorastation.org/topic/11941-antagonist-rework-20/
Pretty much, adds a couple of gear crates that mercenary teams, seeking to do a lore related gimmick, can buy by pooling their crystals. Right now, it is just adds a couple of human related factions, such as eridani, sol alliance, elyra and the frontier.
