Enhancement: calculate the real mass by nodes

[Gordon-Dry]

A)

Instead of using the mass written to the config, do a real calculation:

1. check if it has a node_stack_top and node_stack_bottom, then it is stackable
2. if it's stackable just estimate it's round
3. by using the node values y from node_stack_top and node_stack_bottom and the z value from node_attach it's possible to calculate the volume of the battery, it's just a cylinder
4. find a decent mass/density value depending battery type
5. calculate the mass
6. write it back into the MM cache by a patch

If it's not stackable estimate that it's not round, make a 2/3 estimation of the size relative to the width and estimate that it is max. 40% the height than the width. Just guess.

Or even ignore non-stackable batteries in this process and estimate the devs have written a good value in the config as mass.

B)

Be bad and make it even possible that batteries have different types, not all of them are generally one of these types:
1 = Lead_Acid
2 = Lead_Acid_singleUse
3 = Li_Ion

The battery type to be switchable in VAB/SPH would be awesome.
No more set-it-in-config-and-load-KSP setup.

C)

Make it partUpgradable in career progress which kind of battery even is possible.
1 = Lead_Acid - early career, should get it quick
2 = Lead_Acid_singleUse - very early career, for starters
3 = Li_Ion - later you know, but not in the far future

This ofc depends the used tech tree - but just take CTT as reference.

D) Balance all out. Mass vs. EC vs. SC.

Actually, a stock GameData\Squad\Parts\Electrical\z-200Battery\z-200Battery.cfg has a weight of 10 kg defined in the config.
This battery is round, has a diameter of 62.5 cm and a height of 20cm.
10 kg is not enough. Batteries are dense and heavy.
(mobile phone batteries are just very flat and have a lot of plastic)

But consider this:
RealBattery actually makes a 10 kg battery have 200 EC and 20 SC.
20 SC are valid 72,000 EC.
So a total of 72,200 EC in a 10 kg battery.
Or more than 20 kW/h.

So, after doing A) - C) how much mass would the same battery have then?
And what is a realistic mass/density factor?
How much EC/SC could this (heavier) battery take? By old (now) calculation and by new (nerfed) calculation?

[Gordon-Dry]

btw I always wondered why the amount of SC is a 1/10 of the amount of EC - when 1 SC is the equivalent of 3600 EC that means that the part got 360x the amount of EC converted to SC ... on top of the EC already in there.