Changes for #3739 - sp_BlitzIndex

[VladDBA]

Closes #3739

Added handling for:

• quoted database and object names
• table name prefixed with schema name
• no @OutputDatabaseName and @DatabaseName specified on Azure SQL DB
• no schema name provided anywhere when @OutputDatabaseName = DB_NAME()
• if @SchemaName was not provided try to get it based on @DatabaseName.sys.objects and @DatabaseName.sys.schemas

[BrentOzar]

Thanks for the pull request. Merging into the dev branch, will be in the next release with credit to you in the release notes.