Piper GTR 1.3 +GTR 2.0, 10 cars skinpack, 2k+3k+4k v1.3

Changelog:

- added John Woolfe Racing, No. 25, v1.0
- added Alan Mann Racing, No. 9, v1.0
- added Oldenkott Pipe & Tobacco Racing, No. 36, v1.0

Changelog:

- added Marout Racing, No. 23, v1.0
- added Speed Sport Motobooks, No. 52, v1.0

Changelog:

- 4k Piper GTR 2.0 Levis Int. Racing Team skin inserted. Unfortunately I had forgotten this in the last version. Sorry. ( Thanks @ Fanapryde for the hint)

There is now another skin as compensation.

- added Martini Racing Team, No. 22, v1.0