Built: Base Builder

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-Readjust game mode and removed "Campaign Mode"
-Added building guide line
-Fixed auto-rotation not working
-Added new enemy indicator
-Re-added back the grid in building mode
-Adjusted the way to add blocks in build mode
-Fixed new enemies not spawning bug
-Enemy Health and spawning balance
-Second Adjustment for enemies health and weapon cooldown
-Tweaked the gold reward
-Increased the chance of having different background in game