Support "NVD start year" for CLI

The Maven plugin supports `cveStartYear` to limit the scope of potentially fetched CVE entries. The CLI has no such feature.

**Describe the solution you'd like**
Add `nvdStartYear` for the CLI.

`bin/dependency-check.sh --updateonly --nvdDatafeed=https://dependency-check.github.io/DependencyCheck_Builder/nvd_cache/nvdcve-{0}.json.gz --nvdStartYear=2018` should skip all `.json.gz` files from before 2018.

**Describe alternatives you've considered**
To my knowledge, there are none.

**Additional context**
n/a