New Providers

• Add Telmate/Proxmox provider (@knobik, #157)

Improved/fixed Providers

• Fix non-numeric index fields (as in for_each construct) (@AndiDog, #153)
• Support default tags for the AWS Terraform provider (@S-Bohn, #156)
• OpenStack instance tag support (@markopolo123, #150)
• Fix Cherry servers provider (@shteryana, #147)