Addresses #588, fix #614

Changes proposed in this pull request:

• Add entrypoints for mvs_tool and mvs_report in setup.py (this can be simply typed directly in terminal)
• Create function utils.copy_inputs_template to copy input_template from package data_files
• Create MANIFEST.in file
• Add entrypoint for mvs_create_input_template in setup.py
• Create script prepare_package.py to add data to package and build dist folder
• Rename PACKAGE_PATH to PACKAGE_DATA_PATH
• Update release protocol within Contributing.md
• Remove variable TEMPLATE_INPUT_PATH and field data_files from setup.py

Test locally

• in a new environment run pip install multi-vector-simulator==0.5.0rc13, then make sure you are not in the mvs repo and run mvs_tool, it should create a folder MVS_output
• Delete the folder MVS_output
• You can then run pip install multi-vector-simulator==0.5.0rc13[report] and run mvs_tool -pdf, this should create a folder MVS_output with a subfolder report in which the .pdf report is located (styling of the report is partly fixed in Fix formatting and rendering issues in the autoreport #643)

The following steps were realized, as well (if applies):

• Use in-line comments to explain your code
• Write docstrings to your code (example docstring)
• For new functionalities: Explain in readthedocs
• Write test(s) for your new patch of code (pytests, assertion debug messages)
• Update the CHANGELOG.md
• Apply black (black . --exclude docs/)
• Check if benchmark tests pass locally (EXECUTE_TESTS_ON=master pytest)

_{For more information on how to contribute check the CONTRIBUTING.md.}