demmt: add option to deindent logs
demmt: more colors for nouveau ioctls
demmt: parse additional DRM_NOUVEAU_GEM_PUSHBUF data

... if they were recorded by new enough mmt
demmt: properly decode nouveau pushbuffers

Previously demmt tried to decode all buffers. Now it knows which one
to decode thanks to new DRM_NOUVEAU_GEM_PUSHBUF ioctl parser.
demmt: let mmt_debug/mmt_error output to stdout
demmt: bump maximum number of buffers