Enable a token to represent the unique commits on the current branch as opposed to the 'base' branch

[Kieranties]

Is your feature request related to a problem? Please describe.
The token * is the number of commits since .simpleversion.json was changed.
If I am using * each commit increments the version, yet I may only want that on a release branch (where the actual final version is determined). On a feature branch I want the version to to be whatever it is on the branch I branched from, yet count the unique commits on my current branch

Describe the solution you'd like

• On master I make five commits. The configuration uses "version": "1.0.*". I will therefore get a version of 1.0.5
• I create a branch feature/awesome and complete twenty commits. Using branch overrides, I want to be able to specify that the version created should be 1.0.5-r20

Progress

• Calculating base/branch height where version was last modified on release branch
• As above, with base version calculated via alternate release branch (e.g release/1.0 instead of master)
• Calculating base height where version is changed on the current non-release branch
• Calculating base height where version is changed on merged release branch
• Calculating base height where multiple release branches are merged out of order. E.g. 1.1.x is merged into feature, then 1.0.x is merged after.
• Determine checkout requirements for build servers - Are all refs enough?