fix: store firmware md5 hashes in release package.json

[ert78gb]

Summary:

• use md5 package to calculate md5 hash. It helps to run the build on every platform and not needed to install md5sum
• use path.join instead of string concatenation. It is also for cross-platform build
• reset every VERSION to 0 and git tag and repository to empty string if --withMd5Sums command line argument not provided
• set zero checksum properly for devices and modules
• rename package to packageJson because officially package is reserved word in javascript
• store md5 hashes in the release package.json