Refactor building utility

[coveralls]

Pull Request Test Coverage Report for Build 957

• 205 of 218 (94.04%) changed or added relevant lines in 10 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+1.8%) to 87.495%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
mobula/building/build_dependant.py	34	35	97.14%
mobula/building/build_utils.py	14	16	87.5%
mobula/building/build_latest_code.py	101	111	90.99%
<!--	Total:	205	218	94.04%	-->

Files with Coverage Reduction	New Missed Lines	%
mobula/building/build_utils.py	1	79.76%
mobula/op/loader.py	1	94.8%
<!--	Total:	2		-->

Totals
Change from base Build 955:	1.8%
Covered Lines:	2309
Relevant Lines:	2639

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💛 - Coveralls