Minor tweak to default gas pricing so that a tank of gas isnt worth millions

Quick hotfix by Screaming Angels related to npc entities.

Screaming Angel Added the Following:
* Implements collect command only working near original point of purchase
* Implements sound notification on entering a trade zone.
* Implements performance improvements
* Implements crash workarounds for Havok
* Tweaks HUD (/hud on or /hud off) behavior

Hotfixes/Improvements by Screaming Angels:
Speed!
+ Binary serialisation changes
+ Improved detection of attached objects.
+ EconAPI
Fixes:
+ Issue with new players
+ Handling background ownership changes of Grids better to avoid havok issues.
+ Hud on/off sound not so deafening!
+ You can now safely lock ships for sale to connectors

Hotfix by Screaming Angels for issue with buying and selling out of a cargo grid the player has no access to. <3

Quick hotfix to add canvas item to default price table for new installs etc

Another hotfix for the unlikely event the player has hud enabled AND is part of the space pirate NPC faction.. which conflicts with localisation string format

Some hotfixes to localisation, and admin checks

A few hotfixes and improvements..
A few experimental things..
Oh and an Economy API.. see https://github.com/jpcsupplies/Economy_mod/blob/master/EconomyAPI/readme.txt
for details.
Big Thanks to Screaming Angels this week.

Adds initial hud/quick gps sound effects