Fixed a death-respawn exploit

Fixed a bug where if a player left while viewing the death screen they
may join back to the server still alive at their last autosave point.

Added inventory file to the ClearPlayerInventoryFile function (Since the
change to two data files, it only had removal code for the character
data file)
Added red highlight for banned players in reports

In the reports list, banned players now appear in red to indicate that
the report can be deleted.

Note: It's not optimised! I'm sure there's a much better way to do that.
Fixed radio frequency being set outside the limit

Users could type in any floating point value they wanted for a radio
frequency with the frequency button.