Create f_safeStartHint.sqf

Tracks variable and displays silent hint for clients.
Create f_safety.sqf

Toggles the invincibility of units
Create f_safeStartLoop.sqf

Runs the timing loop server-side, sends out public variable update every minute until timer expires.
Add 'safe start' call
Add 'safe start' parameter
Move mission started hint to client hint loop
Create f_safeStart.sqf

Controls logic of 'safe start'.
True/False typo
Change 'safe start' title to work with stringtable
Add 'safe start' stringtable reference
Change 'off' parameter for 'safe start' to stringtable reference
Change 'off' parameter for 'safe start' to stringtable reference
Merge pull request #69 from CaseMonster/dev

'Safe Start', prevents weapons from being fired and sets playable units as invincible while active.