Rectangle dev

[mingzhang96]

1. allow ball to move over border with center 允许球球跨过地图边界，但是球心不能跨过
2. allow vision over border 玩家的视野可以跨过地图边界，并且始终是正方形，地图外补零表示

[codecov[bot]]

Codecov Report

Merging #39 (a363f9d) into v0.2.0 (d1abc09) will decrease coverage by 1.04%. The diff coverage is 85.18%.

@@            Coverage Diff             @@
##           v0.2.0      #39      +/-   ##
==========================================
- Coverage   88.98%   87.94%   -1.05%     
==========================================
  Files          63       63              
  Lines        4021     4030       +9     
==========================================
- Hits         3578     3544      -34     
- Misses        443      486      +43     

Flag	Coverage Δ
unittests	87.94% <85.18%> (-1.05%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gobigger/balls/base_ball.py	89.33% <33.33%> (-10.67%)	:arrow_down:
gobigger/balls/clone_ball.py	98.11% <100.00%> (ø)
gobigger/render/env_render.py	93.16% <100.00%> (+0.19%)	:arrow_up:
gobigger/hyper/actions.py	54.03% <0.00%> (-14.12%)	:arrow_down:
gobigger/server/server.py	71.38% <0.00%> (-0.33%)	:arrow_down:
gobigger/agents/bot_agent.py	80.11% <0.00%> (+0.58%)	:arrow_up:

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