buildenv: Implement croot to get back to SRC_DIR quickly #237
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UN1CA has been growing in the last months and there are lots of modules and subdirectories, this commit wants to help returning quickly to the top directory with a single command.
croot: Changes directory to the top of the tree, or a subdirectory thereof.
This follows the AOSP implementation of croot in envsetup.sh More details: https://github.com/LineageOS/android_build/blob/lineage-21.0/envsetup.sh#L1083