fix(fms): use entered fob rather than fqi before start

[patmack14]

#8639

Fixes #[issue_no]

Summary of Changes

Added 2 lines: 1.A check to see if an engine is running->Pull from sensed fuel tank levels. 2. Engine !Running -> Pull from entered block fuel 3. Also added some class and method comments noting where top level parameters originate from...spent many hours on a wild goose chase on this PR! Recommend inserting into docs somewhere down the line.

Screenshots (if necessary)

References

@BlueberryKing and @BravoMike99. As previously stated I no longer have access to the pilot Discord channel, unable to use previous verification method.

Additional context

Discord username (if different from GitHub):

Testing instructions

Prior to engine start, the Destination EFOB should be pulling from entered block fuel, after start the figure should switch over to using sensed fuel level in the tanks.

How to download the PR for QA

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