20 chain saw manuals added

20 more chain saw owner's manuals, service manuals, and parts lists were added recently:

- EGO: 1 chain saw manual
- Homelite: 2 chain saw manuals, 1 chain saw parts list
- Poulan Pro: 1 chain saw manual, 2 chain saw parts lists
- Remington: 1 chain saw manual, 2 chain saw parts lists
- Stihl: 2 chain saw manuals, 2 chain saw parts lists
- Talon: 2 chain saw parts lists
- Troy-Bilt: 1 chain saw service manual
- Wen: 3 chain saw manuals