[C#] csharp client generation does not handle "sourceFolder" config setting

Description

If the source folder setting is changed via a configuration file, csharp client generation still generates some files with references to 'src'.

openapi-generator version

main

OpenAPI declaration file content or url

Not applicable. Configuration file, for -c option:

{
"sourceFolder":  "."
}

or any sourceFolder setting other than src.

Command line used for generation

java -jar openapi-generator-cli.jar generate -i swagger.json -l csharp -o ClientAPI -c .\openapi-generation-parameters.json

Steps to reproduce

Generate code. Try to build; it will fail.

Related issues/PRs

None.

Suggest a fix/enhancement

There are a significant number of .mustache files which have the literal string src instead of the {{sourceFolder}} macro; replacing these should fix the issue [not tested]:

Search "src" (12 hits in 5 files)
compile-mono.sh.mustache (2 hits)
Line 43: ${nuget_cmd} install src/{{packageName}}/packages.config -o packages;
Line 68: -recurse:'src/{{packageName}}/*.cs'
compile.mustache (2 hits)
Line 14: .\nuget.exe install src{{packageName}}\packages.config -o packages
Line 26: %CSCPATH%\csc /reference:bin\Newtonsoft.Json.dll;bin\JsonSubTypes.dll;bin\RestSharp.dll;System.ComponentModel.DataAnnotations.dll {{#generatePropertyChanged}}/r:bin\Fody.dll;bin\PropertyChanged.Fody.dll;bin\PropertyChanged.dll{{/generatePropertyChanged}} /target:library /out:bin{{packageName}}.dll /recurse:src{{packageName}}*.cs /doc:bin{{packageName}}.xml
mono_nunit_test.mustache (3 hits)
Line 10: rm src/{{{packageName}}}.Test/bin/Debug/{{{packageName}}}.Test.dll 2> /dev/null
Line 15: mono nuget.exe install src/{{{packageName}}}.Test/packages.config -o packages
Line 22: mono ./packages/NUnit.Runners.2.6.4/tools/nunit-console.exe src/{{{packageName}}}.Test/bin/Debug/{{{packageName}}}.Test.dll
nuspec.mustache (3 hits)
Line 46: <file src="....\README.md" target="" />
Line 47: <file src="....\docs**." target="docs" />
Line 49: <file src="....\packages\Fody.1.29.4\build\portable-net+sl+win+wpa+wp\Fody.targets" target="build" />
Solution.mustache (2 hits)
Line 5: Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "{{packageName}}", "src{{packageName}}{{packageName}}.csproj", "{{packageGuid}}"
Line 7: {{^excludeTests}}Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "{{testPackageName}}", "src{{testPackageName}}{{testPackageName}}.csproj", "{19F1DEBC-DE5E-4517-8062-F000CD499087}"

Start with the five templates named in the issue: compile-mono.sh.mustache, compile.mustache, mono_nunit_test.mustache, nuspec.mustache, and Solution.mustache. Generate a C# client using a configuration file with sourceFolder set to a value other than src, then inspect the generated build files and try to build the client. Done means generated references consistently use the configured source folder and the build succeeds.