Mac version is built with UPDATE 1

The Mac version is just built using my laptop in company. Yay!

I fixed general some bugs and rendering issues (seems happened on MAC only), which I named as UPDATE 1. UPDATE 1 won't be applied on Windows version until I get back home from work and see if everything works fine on Windows.

== UPDATE 1==

• Reduced the lightmap size on MAC
• Fixed the 'BIG ROUND CIRCLE SHADOW' problem on MAC
• Fixed the issue that 'block stacks' may not update merging status when stacks around are merged.
• Fixed the issue that sometimes the terrain and grids cannot be loaded properly