api API: Add a way to get all sectors influenced by faction

[Rinart73]

I'm requesting a function that would allow to get all sectors controlled by a faction through influence (client-side and maybe server-side):

local sectors = {Galaxy():getFactionControlledSectors(int factionIndex)}

Why?

Right now on both client & server we can get all sectors that are owned (have stations in them) by a faction (at least the ones that player/alliance know about):

local sectors = {Player():getKnownSectorsOfFaction(int factionIndex)}

But all owned sectors have influence that spreads in a circle shape around them. And currently there is no performance-friendly way to get list of sectors controlled by a faction through influence.

Currently to get that list I have to do the following:

1. Get all owned sectors of a faction
2. Get the "influence" stat from their SectorView
3. Transform this influence value into a radius (which is bigger than it actually is for some reason)

   local approximateRadius = math.sqrt(influenceValue / math.pi)

    

4. Get all sectors that completely fit in that radius
5. For each of them call this function:

   Galaxy():getControllingFaction(n, m)

 

It takes 1-1.2 seconds to get this info for 1/7 of a galaxy. Not very fast, but right now there is just no other way to do this.