[nasa/nos3#286] Updates to time driver to avoid crash when slowed

[jlucas9]

Added special case to not run slower than 0.12 real time or 80000 real microseconds per tick.

Need to first close the submodule and merge prior to this one:

• [nasa/nos3#286] Updates to time driver to avoid crash when slowed nasa-itc/nos_time_driver#6

[kevincbruce]

Tested, stops at 0.12 as expected, and doesn't crash. Still was some weird behavior when I increased speed by too much, but allowed me to slow back down without crashing as well, so looks good to me!

[Isgaroth-the-Green]

I also found it to work as intended.

[dacarter22]

Found to work as intended unless rapidly sped up then slowed down in which case decimal values change the lower limit to .13 and then crashes if lowered beyond that. I believe, it crashes if you crank the speed way up then down. because it starts rounding off once you get to higher numbers you start getting decimal values. and when you turn it back down after that it lands on 0.13 not 0.12 then one more crank down crashes the program
Sorry I left review comment in wrong place earlier.

[msuder]

I reworked the fix to
#286
to fix the crash David Carter saw and to make speed-up/slow-down more robust in general.