Add '--in-place' option for "kpm wrap"

[ChengTian]

kpm wrap --in-place generates project.json in the same folder as given csproj file. Once this option is specified, it is also implicitly applied to wrap operations for all csprojs referenced by given csproj.

[ChengTian]

@davidfowl , do we want to do the following thing?

kpm pack <csproj_path> --in-place also checks whether <csproj_path> is inside sources dirs specified in global.json. If not, we add it into sources of global.json.

Sometimes it can be confusing if a user does a successful kpm wrap --in-place but he still failed to reference the wrapped project, when he forgets to add the project dir into global.json sources.

[davidfowl]

Yes, it needs to work the same way.