Time for action – setting up the variables

Let's start off with introducing all the variables needed to run the game:

1. Create a brand new main.lua file and add it in the Panda Star Catcher project folder.

2. Let's hide the status bar from the devices and set all the variables needed in game:

   display.setStatusBar( display.HiddenStatusBar ) -- Hides the status bar in iOS only
   
   -- Display groups
   local hudGroup = display.newGroup() -- Displays the HUD
   local gameGroup = display.newGroup()
   local levelGroup = display.newGroup()
   local stars = display.newGroup() -- Displays the stars
   
   -- Modules
   local physics = require ("physics")
   
   local mCeil = math.ceil
   local mAtan2 = math.atan2
   local mPi = math.pi
   local mSqrt = math.sqrt
   
   -- Game Objects
   local background
   local ground
   local powerShot
   local arrow
   local panda
   local poof
   local starGone
   local scoreText
   local gameOverDisplay
   
   -- Variables
   local gameIsActive = false
   local waitingForNewRound
   local restartTimer
   local counter
   local timerInfo 
   local numSeconds...