Add more information on the passthru code coverage property

[Thilas]

Per #727, I'm adding a few informations on the code coverage property returned by Invoke-Pester when using -PassThru parameter:

• StartLine & EndLine
• StartColumn & EndColumn
• HitCount

I kept though existing Line but it's just returning the same value as StartLine. This is only for compatibility purpose and I was wondering if this is necessary here?

I also removed AllCommands that was introduced by #920 but to me it's redundant with what is already provided (i.e. HitCommands and MissedCommands).

@nohwnd, any thoughts? Could you review? Thanks.

[nohwnd]

@Thilas Not sure if the Line is necessary but I would keep it to avoid breaking change. The AllCommands was not released so it's okay that you replaced it. Thanks!