This commit fixes Items that looked way too small on conveyor belt.
Changed items: bi-seed, seedling, bi-woodpulp, bi-ash, wood-charcoal, stone-crushed.
Almost all of them now have pictures with various sizes (-0.02; +0.02) for additional realizm.
P.S. This will, probably, require more changes in future. For example "seedling_7.png" even with scale of 0.72 still looks small. Increasing this value to 0.8 and higher, adds visible blur to texture...
Rails are now fast-replaceable and can be upgraded with upgrade plan.
Note: To degrade rails back to wooden it's required to manualy select ALL rail variants (straight, diagonal, curve) in upgrade plan and select wooden replacemnet for them.
