Get rid of special include orders and forward declarations

This issue has been tracked since 2022-02-06.

Oddities such as the ones listed below are deeply confusing already, and are obviously module-hostile. There are probably better ways to deal with that.

Principia/quantities/generators.hpp

Lines 29 to 30 in b0bec96

    
           // Because of circular dependencies, this file doesn't include 
        
           // generators_body.hpp.  This will be done by quantities.hpp.

Principia/quantities/quantities.hpp

Lines 176 to 179 in b0bec96

    
           // Include before quantities_body.hpp all the bodies that want to see the 
        
           // definition of class Quantity. 
        
           #include "quantities/generators_body.hpp" 
        
           #include "quantities/wide_body.hpp"

Cross-module forward declarations are impossible, so we should probably try to minimize forward declarations as well.

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More Details About Repo

Owner Name	mockingbirdnest
Repo Name	Principia
Full Name	mockingbirdnest/Principia
Language	C++
Created Date	2014-02-08
Updated Date	2023-03-29
Star Count	664
Watcher Count	29
Fork Count	62
Issue Count	109

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Issue Title	Created Date	Updated Date

	// Because of circular dependencies, this file doesn't include
	// generators_body.hpp. This will be done by quantities.hpp.

	// Include before quantities_body.hpp all the bodies that want to see the
	// definition of class Quantity.
	#include "quantities/generators_body.hpp"
	#include "quantities/wide_body.hpp"