Restructure projects app models

hypha/apply/projects/filters.py

hypha/apply/projects/forms.py

hypha/apply/projects/migrations/0011_add_packet_file.py

hypha/apply/projects/migrations/0012_adjust_storage_class.py

hypha/apply/projects/migrations/0013_add_contract.py

...ly/projects/migrations/0014_add_payment_related_models.py

.../migrations/0023_ensure_contracts_uses_private_storage.py

hypha/apply/projects/migrations/0025_add_report_models.py

hypha/apply/projects/models/__init__.py

hypha/apply/projects/models/payment.py

hypha/apply/projects/models/project.py

hypha/apply/projects/models/report.py

hypha/apply/projects/templatetags/contract_tools.py

hypha/apply/projects/views/payment.py

hypha/apply/projects/views/project.py