[AAI Loaders] Suggested py compatability update

[mikelat]

I got some suggested updates for AAI Loaders and Pyanadons that was suggested that I post from here https://discord.com/channels/419526714721566720/1107163002060423190 with code (at the bottom)

Changes:

• Fast loader tech now uses fast belt technology as the basis for it's cost and prerequisites (currently fast loaders can only be unlocked 2 sciences above fast belts because the science costs chemical science and a prereq of advanced circuits - resulting in an awkward 400+ hour plus gap where you have red belts but can't use the loaders associated with them)
• Modified the costs of loaders to be based on splitters at the equivalent tier rather than different types of inserters (currently the loaders are oddly cheap - with fast loaders requiring small parts and simple circuits when their equivalent belts, undergrounds and splitters require advanced parts and complex circuits. This results in loaders overall being more expensive).

The changing of the cost isn't as important, feel free to exclude it. The tech tree fix is more of what I think is a big issue.

Here are my changes to prototypes/loader-sets/pyanodons.lua pyanodons.txt

Thanks

[mkaito]

While we're on topic, why not adjust the other two loader techs? At least, I really don't think basic loaders should require logistics science packs in Py. Hell, I would argue it shouldn't require Py science 1 either. Logistics 1 requires only automation science (and circuits...). Loaders require that plus Duralumin. That's plenty gatekeeping for early game logistics tooling I think.