HPM: Trade.c Completed

Already was about complete, just moved the definition to the .h so that plugins may rely on the value,
also updated the trade.c header given the file had been previously modified (when the trade interface was implemented)

Signed-off-by: shennetsind <ind@henn.et>
HPM: Searchstore.c Completed

Moved missing declarations of interest.

Signed-off-by: shennetsind <ind@henn.et>
HPM: pc.c Completed

Moved missing vars and declarations of interest into the interface.

Signed-off-by: shennetsind <ind@henn.et>
Merge branch 'master' of https://github.com/HerculesWS/Hercules