Uiautomator2

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* upgrade atx-agent version, and android-uiautomator-version, update doc
* fix swipe\_points usage in readme
* init add mirror of appetizer
* fix str decode error
* fix debug mode decode error

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* add watch\_clear and address
* add xpath.watch\_stop()

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* fix debug curl print
* fix shell calls in connect

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* fix 370
* test with 3.5

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* fix fix
* fix travis again
* fix travis
* update readme
* add missing dep:adbutils
* update xpath doc, add set\_text to xpath
* remove uiautomator2/adbutils.py, use thirdparty adbutils
* add quickstart, fix healthcheck for OnePlus
* fix screenshot method
* say goodbye to python2 and welcome python3
* Update ISSUE\_TEMPLATE.md
* use /dump/hierarchy to instead of call:dumpHierarchy
* update atx-agent version

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* xpath element support click
* add http\_timeout for shell function, resolve 353
* add xpath quicksheet
* resolve 348
* remove code which leads to minicap install error
* add get method of xpath
* add xpath::get\_text(), close 337
* add connect\_adb\_wifi function
* add probot link
* auto stale issue when tagged as invalid
* serial support none
* 修复多台设备时，list-forward失败 (327)
* \`python -m uiautomator2 init\`初始化403报错，增加header atx\_agent\_url中报错变量错误修复