Analysis order based on import graph

[AlexanderSher]

GetEntriesThatImportModule is required to queue dependent modules for reanalysis when the dependency has changed. If dependent module analysis isn't finished, GetEntriesThatImportModule skips it.

[MikhailArkhipov]

I am going to rename it since we should not need to reanalyze - if we know the import order based on graph for #12, #71 we should just analyze in order from root to leaves. Which will also fix #163

[lostmsu]

I am experiencing an issue where in some cases, ClassInfo.Bases[0] keeps pointing to empty analysis set, when the code looks like this:

from module import BaseClass

class DerivedClass(BaseClass):
  ...

After analysis is finished, I can query variable BaseClass in module, and it will show user class .... However, DerivedClass.Bases[0] is still pointing to an instance of AnalysisSetEmptyObject.

The above import for the first time is analyzed before BaseClass, however, DerivedClass bases are never reanalyzed after that.

I wonder, if this is the root cause for this behavior.

[MikhailArkhipov]

#432