Upgrade to NetStandard 2.0

[FraserGreenroyd]

Issues addressed by this PR

Fixes #17 - second attempt.

I opted to take the same approach as for the SQL Toolkit PR to handle the lack of compatibility needed with Grasshopper highlighted in the first attempt in #18.

Test files

1. Install a recent alpha or the 6.1 beta (either works).
2. Delete Excel_Adapter.dll, Excel_Engine.dll, and Excel_oM.dll from your local assemblies
3. Compile in debug mode - this should give you the same DLLs as the installer
4. Run test scripts of your choosing - these should run successfully without errors
5. Compile in ZeroCodeTool mode - this should give you a new output folder in the Excel_Toolkit/Build location
6. Hmm - how to test this bit?!?
7. I'd recommend making a new .Net6 project, referencing the DLLs and try to pull some data replicating a script used in step 4. Providing the code compiles without compiler warnings (compiler warnings should relate to trying to use .NetFramework in .Net environments - these should NOT appear with this work) and data can be pulled into a console, this should be sufficient?

Excel_Toolkit_Test.zip

But same as SQL_Toolkit, I'm a bit kind - this zip file should help with testing steps 6 onwards - it contains a .Net6 solution with references to the right DLLs/nugets that would come if the NetStandard adapter was included via a nuget (the ultimate end result for this work). You will need to reference the Excel_Adapter, Excel_Engine, and Excel_oM from your local build of Excel_Toolkit/Build/netstandard2.0 folder - but the other DLLs are already hardcoded for C:/ProgramData/BHoM so hopefully minimal set up needed! You will need to update line 11 to your directory if you do use this. You can also set it up to pull data from other sheets in addition to the test one I've included.

Also feel free to not use this - but it's what I made to help debug/run through my own testing instructions so figured I might as well share it! 😄

Additional comments

Other work to be included for audit as to how this approach ended up being picked:
PR #18

[FraserGreenroyd]

@BHoMBot check project-complianced

[bhombot-ci]

@FraserGreenroyd sorry, I didn't understand.
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[FraserGreenroyd]

@BHoMBot check project-compliance

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@FraserGreenroyd to confirm, the following actions are now queued:

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[bhombot-ci]

@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. 12972870256

[FraserGreenroyd]

@BHoMBot fix project file ref. 12972870256

[bhombot-ci]

@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]

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

[bhombot-ci]

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

[FraserGreenroyd]

@BHoMBot check project-compliance
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[adecler]

I cannot really contribute much about the change in VerifySecurityEvidenceForIsolatedStorage as I was not really involved into that.
But, otherwise, the code changes make sense and all is working well when going through the steps described in the original message.

[FraserGreenroyd]

@BHoMBot check compliance
@BHoMBot check required

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@FraserGreenroyd to confirm, the following actions are now queued:

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[bhombot-ci]

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[FraserGreenroyd]

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[FraserGreenroyd]

@BHoMBot check ready-to-merge

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@FraserGreenroyd to confirm, the following actions are now queued:

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