Fixed writing of:
- Path nodes
- Node links
- Path clusters
- Cluster links
The previous globals 'g_pppAiNodeClusters' and 'g_pppAiNodeClusterLinks' were of type CUtlVector. These have been retyped and renamed accordingly.
Also mapped the CAI_Cluster class out slightly more.
Rebuild of path clusters and cluster links are still not correct; parsing a file in from r2, results in a different file on the disk, at the very offset the clusters are being written in (one field is off, this will be investigated soon).