Upgrade to .NetStandard2.0

[FraserGreenroyd]

Issues addressed by this PR

Fixes #58

[FraserGreenroyd]

@BHoMBot check project-compliance

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `project-compliance` There are 5 requests in the queue ahead of you.

[bhombot-ci[bot]]

Please be advised that the check with reference 12015750880 has more than 50 annotations of notes. API limitations restrict annotations to 50. You may need to rerun this check to obtain the next set when you make changes. At the time of reporting this check, there are 7 additional annotations waiting, made up of 7 errors and 0 warnings.

[bhombot-ci[bot]]

@FraserGreenroyd fix requested for project compliance. The errors with the CSProject (`.csproj`) files have been recorded as annotations on the checks tab. I will apply the fixes to every case detailed on the checks tab with the exception of any references to the target framework. I am unable to provide fixes to the Target Framework automatically, these will need to be performed manually. If you want to perform the fixes in a different manner please resolve this manually and rerun the check. If you are happy for me to go ahead and perform this action, please reply with: > @BHoMBot fix project file ref. `12015750880`

[FraserGreenroyd]

@BHoMBot fix project file ref. 12015750880

[bhombot-ci[bot]]

@FraserGreenroyd I have queued up your request to fix the `csproj` file(s). There are 0 requests in the queue ahead of you.

[bhombot-ci[bot]]

@FraserGreenroyd I am now going to fix the project compliance in accordance with the annotations previously made.

[bhombot-ci[bot]]

@FraserGreenroyd to confirm I have now resolved the project compliance issues and pushed a commit to this Pull Request.

[FraserGreenroyd]

@BHoMBot check compliance

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `code-compliance` - check `documentation-compliance` - check `project-compliance` - check `branch-compliance` - check `dataset-compliance` - check `copyright-compliance`

[FraserGreenroyd]

@BHoMBot check core @BHoMBot check null-handling @BHoMBot check serialisation @BHoMBot check versioning

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `core` - check `null-handling` - check `serialisation` - check `versioning`

[FraserGreenroyd]

@BHoMBot check installer

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `installer`

[FraserGreenroyd]

@BHoMBot check ready-to-merge

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `ready-to-merge` There are 5 requests in the queue ahead of you.