Who/Channel Visibility

[Tieryo]

Seen this come up a couple times with regards to deathsight, but would make sense overall - Why not have who and channels ignore every form of invis except for wizi/incog. This would make helping newbies much easier, while still retaining the utility of invis (not showing up on where or in the room without proper detects).

[Tieryo]

Created ~~[bug=74]~~Issue #74[/bug] to handle this.