Feature/focus manager#4

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tlittleworthdubit wants to merge 4 commits intodubit:developmentfrom

tlittleworthdubit:feature/focus_manager

Commits on Jul 19, 2019

Assembly definitions added
borntocompile
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Commits on May 21, 2021

Added a focus manager to serialize selectable objects, order them in the inspector to allow selectables focus to be switched with the tab input.
tlittleworthdubit
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Commits on Jun 7, 2021

☂ Mostly formatting changes and renames for PR.
tlittleworthdubit
committed

Commits on Jun 11, 2021

🐛 Fixed null reference and selectables being deslected.
tlittleworthdubit
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