Fixing missing imports

[Timm638]

Describe the bug
The init.py files have been cleared after the restructuring of the pipeline components done in #90 . While this makes working with the library not impossible, it bloats the code needed for importing components, especially for #96 .

To Reproduce

Steps to reproduce the behavior:

1. Pull RTDIP Demo Notebook #49
2. Merge commit 0277a5c into the branch, accept files from branch
3. See that even when correctly renaming the imports they aren't working anymore

Expected behavior

Imports in the notebook is working

Screenshot