Black Sh33p Parameters; HC Support

Added the infrastructure for extending the Mission Parameters outside of
F3. Added a single include to F3 *description.ext*; added new *s*
directory for storing sh33p modifications to the mission to keep them
independent from F3, including *init.sqf* extension; initial
implementation of HC support - will need testing
UAV Parameter

Added Mission Parameter for UAV Intro; moved UAV code to *s* directory
Fog Parameter

Added new parameter for enabling or disabling the custom fog; added
local vars for declaring fog settings