* Convert counter def format to YAML
Converts counter definition format to YAML with the
following structure:
```yaml
COUNTER_NAME:
architectures:
gfxXX: // Can be more than one, / deliminated if they share idential data
block: <Optional>
event: <Optional>
expression: <optional>
description: <Optional> // In case per arch notes are needed
gfxYY:
...
description: General counter desctiption
```
All counters (derived and hardware) are now defined
in the same file for ease of future additions/subtractions.
Removes existing XML parser. Keeps the existing XML
definitions for now (since other tools still rely on
its presence).
Benjamin Welton
34897d318f