Npc can handle multipe power gen cbm

[Fris0uman]

Summary

SUMMARY: Bugfixes "Npc can handle multipe power gen cbm"

Purpose of change

Npc can handle multipe power gen cbm
Fixes #35559
Internal Furnace CBM is NPC useable

Describe the solution

Fix wants_to_recharge_cbm() and recharge_cbm() logic to handle having multiple power gen CBMs
Add "BIONIC_NPC_USABLE" flag to Internal Furnace since it already has code to handle useage by NPCs

Describe alternatives you've considered

Testing

Get NPC
Give power bank Mk2, Laser finger, ethanol burner
NPC ask for ethanol,
Give ethanol
NPC refuel CBM
wait
Ethanol Burner turns off
wait
No message, no crash
Spawn Z
NPC shoots Z
Turns ethanol burner on
Power is recharged
Turns ethanol burner off

Install Battery system
No infinite loop
Spawn Z/NPC shoots
NPC ask for battery and turns on ethanol burner
wait
Power goes up
wait, no complain, no infinite loop

Spawn new NPC
Give power bank and internal furnace
NPC ask for junk
Give plank
NPC recharge 70 kJ with plank
Give another
Same

Additional context

NPC will use the first CBM with fuel

[BevapDin]

Suggested change

	return no_fueled_cbm;
	return get_fueled_bionics().empty();

And get rid of the variable. It's only used here.

And why do NPC want to recharge their bionic power if they don't have any fuelled CBMs?

[Fris0uman]

bio_furnace and bio_reactor don't use the fuel system but NPC can use them.