Improve code quality #39
Description
Improve overall quality of C++ code.
- Constructor, copy constructor and destructor should be explicitly defined for all classes.
- Nifti image class would need a major refactoring to support any data type.
- Grid dimensions and slicing indices should be managed in a standalone class rather than inside the SH field class.
- Better error handling; throw exceptions instead of crashing with undefined behaviour.
- Callbacks should be destroyed when the object they are linked to is.
- Etc.