Added Configuration.Name and Configuration.Platform into output .csproj

[DDev101]

Issue: #359

This is my attempt at fixing this issue.

Configuration Names and Platforms are now generated inside the .csproj description and now show up as proper configurations in visual studio .

Changes include:

• Modification to ProjectDescription in Csproj.Template to no longer contain PropertyGroup begin/end tags
• Added ConfigurationsItemBegin ConfigurationsItemEntry ConfigurationsItemEnd properties for generating configuration names
• Added PlatformsItemBegin PlatformsItemEntry PlatformsItemEnd properties for generating platforms for project configurations
• Modification to how ProjectDescription is generated when Generate() is called.
  First it writes a PropertyGroupStart, writes ProjectDescription then writes ConfigurationItemBeing/Entry/End items and PlatformsItemBegin/Entry/End items and finally writes a PropertyGroupEnd

[DDev101]

This actually requires updates to tests. I will make a change soon

[DDev101]

On branch "main" it seems that tests are already broken.

I assume there is no relation to this change.

Ready for checks