PLT-7853 Added thumbnail for SVG attachments (#176)
PLT-7853 Added thumbnail for SVG attachments (#176)

* PLT-7853 Added thumbnail for SVG attachments

* Fixed loading of SVG attachment thumbnail

rickbatka/mattermost-webapp,rickbatka/mattermost-webapp,rickbatka/mattermost-webapp,rickbatka/mattermost-webapp