Fixes build warnings about coupled && and || without parentheses
Merge pull request #385 from hean01/master

Fixes build warnings about coupled && and || without parentheses
Make "Shop" and "Cancel" action labels configurable / tranlatable.
Merge pull request #384 from dorkster/bugfixes

Ignore power id 0 when saving/loading power list
Merge pull request #386 from hean01/npc_actions

Make "Shop" and "Cancel" action labels configurable / translatable.