Many Things

改的有点多：
1、加入了计分的API
2、加入了游戏逻辑的主要类Tetrisor TODO
3、更改了定位方式，现在的方式为左下定位，这样最上一行有隐藏的一行保证仅有一行还是可以生成方块
Many Things (2)

提交不完全
Rewrite Score System and Rename something
Add Achievement System and clean up codes
Add Id to Block
moving files
Merge remote-tracking branch 'origin/master' into gamelogic

Conflicts:
	Tetris/Block.cs
	Tetris/GameAPI.cs
	Tetris/TetrisGame.cs
Repair typo from merge
Add Item System

Add the Gun Item

use Up arrow to fire
Add TonItem and InverseGunItem
Simple engine
Add ItemSquare
Merge remote-tracking branch 'origin/BasicGUI' into gamelogic

Conflicts:
	Tetris/TetrisGame.cs
Merge FIx
modify DuelGame
add Line feature
Repair Bugs and add InverseSquare, SpecialBlock
Merge remote-tracking branch 'origin/master' into gamelogic

Conflicts:
	Tetris/Block.cs
	Tetris/Tetrisor.cs
Fix merge bug
Add AI of gun, inv gun and ton