Move survey_universe to empire module and call it earlier

[Grummel7]

This should fix #3760 for good.

It also makes sense as a refactoring, since survey_universe mostly sets values in the empire module and was completely independent from the rest of ColonisationAI.

It does also set some value in the colonization module (nice mix of spelling ;-) which should probably be protected by locks as well, but this can be done with a later PR, this one is big enough and is needed as a fix.

[Cjkjvfnby]

Maybe just move aistate.prepare_for_new_turn() into the action list after ColonisationAI.survey_universe?

Most of the code before action_list is timers and debug prints, so I'd prefer survey universe calls after that.

Actually prepare_for_new_turn() is a number of small functions without arguments, so we could just "inline" it here and put all calls to the list directly. This will give us the flexibility to adjust orders.

The survey universe does a single cycle over everything and collects information.
Algorithmically doing this cycle twice does not look good. But this could simplify the logic. If we will have 2 or more cycles we could deal with temporal coupling in much easy way.

[Grummel7]

survey_universe must be called before this line because get_capital needs the information.

I wonder whether we can get rid of survey_universe completely by doing the calculation in the cache_for_current_turn-functions, like it did it for _get_pilot_summary (see second commit). We wouldn't even need the lock anymore then, but of course we would have a dozen loops instead of one.

[Cjkjvfnby]

@Grummel7 , please apply isort to the code.

https://github.com/freeorion/freeorion/runs/5702180393?check_suite_focus=true

[Grummel7]

@Grummel7 , please apply isort to the code.

https://github.com/freeorion/freeorion/runs/5702180393?check_suite_focus=true

Done it. You can merge it now, I cannot do that...