typedefs

[parnet]

the modern way for using type definitions is the use clause instead of
typedef SmartPtr SP_Typename;
the using declartion can be used
using SP_Typename = typedef SmartPtr;

this also support template arguments
template
using ParallelV = ParallelVector<Vector>

ParallelV
ParallelV

and simplify search for definitions if ide does not support this

anyway in some parts of the project
typedef ElementStorage<base_object> ElementStorage;
is used which switches meaning of declaration and hides the original type
this affects also AttachmentPipe, AttachedElementList, SectionContainer, ...