Replaced RouteTables and Routes with generated

[EvgenyAgafonchikov]

Description

[Draft version to discuss possible generation improvements etc.]

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[cormacpayne]

@EvgenyAgafonchikov GET cmdlets shouldn't support ShouldProcess; I would update the generator to reflect this.

[cormacpayne]

@EvgenyAgafonchikov this cmdlet should support ShouldProcess

[cormacpayne]

@EvgenyAgafonchikov one last thing, the markdown files for the corresponding cmdlets you made the ShouldProcess changes to will need to be updated so they have the correct set of parameters (the markdown for the cmdlet you removed ShouldProcess from still has Confirm and WhatIf, and the cmdlet you added it to does not have those parameters).

[cormacpayne]

@EvgenyAgafonchikov ping