improve the logic for searching toolchain and python #544
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To keep the toolchain in the project folder is not a good practice. I prefer to use the system wide toolchain. And the default toolchain is a little old. Maybe we can create a wiki on where to download the latest toolchain and how to install it system wide. This commit will search the toolchain in system environment first, if it find nothing, it will search in the project or it will give an error to prompt execute make arm_sdk_install.