[Suggestion/QoL] Trade filters for all objects/only stations/only build storages

[azaghal]

(suggested by Outliver a month ago as part of larger QoL list - viewtopic.php?p=5262061 - posting anyway since devs state they prefer individual items, and I had details written out already)

While the map menu is open, player can apply a number of trade filters through the "Filter Settings" tab. This lets player hide a lot of uninteresting trades based on ware prices, availability etc.

It would be nice if one of the filters included would be able to explicitly restrict the shown trades to build storages only. This would help the player prioritise (manual) delivery of wares to friendly or neutral factions in order to boost their economy (by helping them build out their production facilities). This feature would be particularly useful for helping the Split factions, since they very often get cut off from essential station construction wares by Xenon incursions, forcing the player to intervene to ensure they do not get wiped out because they are unable to build out their economy.

This would be, to a lesser degree, also very useful for player's own faction - especially as the number of parallel constructions increases towards the late game and it becomes harder to keep track of everything (every now and then you might get some station construction stuck due to priorities, pricing, and trading ranges).

To make the new filter both flexible and consistent with existing elements, new drop-downs would be introduced under "Your Trade Offers" with the following options:

• For buy offers (first drop-down):
  • Buy offer: All objects
  • Buy offer: Only stations
  • Buy offer: Only build storages
• For sell offers (second drop-down):
  • Sell offer: All objects
  • Sell offer: Only stations
  • Sell offer: Only build storages

This kind of split would let the player easily combine these new filters with the existing ones - for example listing all sell offers from own faction, and all build storage buy offers from other factions.

P.S.

There might be also some other interesting types of offers included in the list above as distinct options - like auxilliary ships, but I am not sure how useful that would be (possibly very rarely used?). Another buy offer type that could be useful in the list would be HQ buy offers and/or HQ current-terraforming-related buy offers - this can help a bit when issuing bunch of orders for HQ deliveries (including repeat orders).

P.S.S.

If some of the toggle suggestions (from viewtopic.php?t=468467) ever get implemented, it would be nice if these new filters were exposed in similar manner as well.