Feat
- **soda4lca**: add `search processes` method to soda4lca client
- **soda4lca**: add `download pdf` method to soda4lca client
- **soda4lca**: add `export to zip` method to soda4lca client
- **soda4lca**: add `get category list` method to soda4lca client
- add base api client
Fix
- **openepd**: add links to declaration and pdf
- **soda4lca**: add error handling for processes with missing PDFs
Refactor
- **soda4lca**: rename common http module