Add-in manifest: increase maximum Image ID attribute length to 64 symbols

When I attempt to validate the manifest with reasonable icon names like "RemoveVelixoFormulasInCurrentFile.80x80" we're receiving an error that it's too long:

id: '432d95ab-aa94-4329-a37c-de84b2aeb401',
title: 'XML Schema Validation Error',
content: 'Error found during XML Schema validation.',
code: "The 'id' attribute is invalid - 

The value 'RemoveVelixoFormulasInCurrentFile.80x80' is invalid
according to its datatype 

'[http://schemas.microsoft.com/office/officeappbasictypes/1.0:ImageReferenceId]'

The actual length is greater than the MaxLength value.",

We have many icons, too. From my perspective it doesn't make sense to have IDs so short, could it be at least 64 symbols?

We're using office-addin-manifest and .validateManifest function to validate the add-in manifest upon build.

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