RULE_SHIP_SPEED_FACTOR creates various buggy effects

[MichaelCourtney]

https://freeorion.org/forum/viewtopic.php?t=12702&sid=a09694ba0800090ad5a8ba10696fb97f

[agrrr3]

description is very vague; linked thread is mostly off-topic

i checked what works: hull basic speed, engine parts
what is confirmed not to work: lighthouse bonus

note also it is fun to set the speed rule to 10

[MichaelCourtney]

I'll test myself when I get a good chance. I suspect traffic control policy will also be out, and the build times for colonies will be based on normal speed ships

[agrrr3]

colony buildtime could be divided by the speed rule value (default value is 1)

else i think checking the focs files if the relevant SetSpeed effects (lighthouse,exploration,traffic control) use the speed rule multiplier should be enough.

one thing which needs consideration is the charge policy. i guess it should scale with the game rule. i.e. if the game rule is 10, a minimum speed of 1000 and not 100 should be necessary