yamler: use shared copy of yamler library

General MR

Summary

This isn't the correct, final resting place of the yamler library but a POC of showing the changes required to pull a library like this from some other repo.

Relevant logs/screenshots

Compiles okay:

danieldides@BPH-MAC14 ~/P/b/p/bbctl (dd/test-yamler-library)> make install
make installing...
./scripts/install.sh
installing from /Users/danieldides/Projects/big-bang/product/bbctl...
danieldides@BPH-MAC14 ~/P/b/p/bbctl (dd/test-yamler-library)> 

Linked Issue

#281

Upgrade Notices

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