Independent Module Versioning

[peombwa]

This PR adds ability to version and add release notes to modules independently.
The version numbers and release notes will be set as follows :

• Generated modules : Version numbers and release notes are specified in a module's readme.md.
• Authentication module : Its version number and release notes are specified in its PowerShell module manifest Microsoft.Graph.Authentication.psd1.
• Meta-module : Its version number and release notes are specified in ModuleMetadata.json.

This PR also validates the current set version number on a module against what's on PowerShell Gallery. This is done by considering the following :

• If a module is not found on PS Gallery, an new module is generated with a version number of 0.1.1.
• If a module's version number is higher or lower, and is not valid (wrong segment increments), generation is stopped, and an error is thrown. e.g. 0.1.9 -> 0.2.1.
  
• If a module's version number is equal to what's on PS Gallery, then its generation is skipped, and a warning message is logged.
  
• If a module version number is considered valid (segment increments are valid), then the module is generated. e.g. 0.1.6 -> 0.2.0.

Closes #88
Unblocks #79

[MIchaelMainer]

Questioned asked IRL