xmake v2.1.6 released, fix some bugs

原文链接 https://waruqi.github.io/2017/08/16/update-v2.1.6/
注：以下为加速网络访问所做的原文缓存，经过重新格式化，可能存在格式方面的问题，或偶有遗漏信息，请以原文为准。

This release fixed some bugs and improve some compilation problem.

If you want to known more usage, please see online documents。

Source code: Github, Gitee.

Improve add_files to configure the compile option of the given files
Inherit links and linkdirs from the dependent targets and options
Improve target.add_deps and add inherit config, .e.g add_deps("test", {inherit = false})
Remove the binary files of tbox.pkg
Use /Zi instead of /ZI for msvc