Multi-GPU process information not available for all GPUs

[JeremyMain]

The process information being displayed is only for the first (primary) GPU.
Add details as to which GPU the process is on and collect the process information for all GPUs

[JeremyMain]

Added support for multi-GPU details. This information is not serialized into the GPD file.
Due to the limited space I reduced the header labels.
ID = GPU Index
GP = GPU SM Utilization
MC = GPU Memory Controller Utilization
EN = GPU Encoder Utilization
DE = GPU Decoder Utilization