Add initial base orientation parameter to Bullet interface

[coveralls]

Pull Request Test Coverage Report for Build 5189292959

• 6 of 6 (100.0%) changed or added relevant lines in 3 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.08%) to 82.295%

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Files with Coverage Reduction	New Missed Lines	%
utils/Spinlock.h	2	71.43%
<!--	Total:	2		-->

Totals
Change from base Build 5080415467:	-0.08%
Covered Lines:	1334
Relevant Lines:	1621

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💛 - Coveralls