Consolidate Version Text

[jadeandtea]

Description

Created a VersionInfo class that is the centralized authority for the version of LEGUP. The version is stored within version.properties file.

Closes #70, #626

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Enhancement (improvement to an already existing feature)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

The version number is taken from the <LEGUP>/legup-update/bin/main/edu.rpi.legupupdate/VERSION file when displayed in various locations within the program.

Checklist:

• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (if applicable)
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes