various tweaks and fixes (details in comment)

[TaxiService]

32² walls 1.1.3:

• added diagonal rail gates
• removed requests for t3 speed modules from both unloaders
• removed requests for arty turrets from building unloader
• reworked artillery unloader slightly, and added a system that prevents it from unloading shells until 80 laser-turrets are in storage

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4-stop modular mines 1.4.4:

• the medium power poles connecting the entry signals are now connected to the main power grid
• added a discrete request for bots to minebuilder unloader (should fix never-fulfilling hacked 'port requests)

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earlygame modular mines 1.1:

• added discrete requests for bots to [U] MINE BUILDER blueprint's loadouts
  (this change is so minor that i didnt increase version number. fight me!)

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rush to bots 4(b).1:

• removed train mall (will be in a separate chapter of the prod book)
• added standalone yellow/purple build and space-science build
• startermall main-block now also crafts electric-miners, radars, boilers and water-pumps
• increased rpg production in startermall ammunition
• reworked startermall's power/logi nets slightly
• fixed wrong pipe connections in startermall's nuclear fuel production
• added input combinators to all startermall steps

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shell factory 3.2:

• reinstated separate schedules for arty-trains and cargo-trains
• added different stackers for arty-trains and cargo-trains
• added mini launchpad
• fixed missing request-from-buffer-chest flags in main loading area
• tweaked buildtrain requests