fix: Improve DM parsing

[marvin9257]

• Please check if the PR fulfills these requirements

• [x] We use semantic versioning (https://github.com/semantic-release/semantic-release to be specific), so follow https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#-git-commit-guidelines
• [ ] Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Bug Fix and Features

• What is the current behavior? (You can also link to an open issue here) Current parsing of Target DM string can't handle numbers in labels Must calculate new traveller finance values outside system when making delta adjustments

• What is the new behavior (if this is a feature change)? Allow for more flexible parsing Can now enter delta values into finance fields and system will calculate an updated total

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• Other information: