Support B9 Part Switch

[Lisias]

As the title says, see forum for references.

This task will be tackled down on https://github.com/net-lisias-ksp/TweakScaleCompantion_FuelSwitches

[Lisias]

Fellow Kerbonaut Accidental Dissassembly found something interesting on Forum:

I'm seeing a weird behavior on 1.12.4 with (most recent) TweakScale, and I'm reasonably confident it is a conflict with (most recent) B9 part switch fuel switching. I believe this because on a clean install (only TweakScale, ts companions, Recall) it doesn't occur, and when I add b9 part switch and CryoTanks (which applies fuel switching to tanks so I don't have to), along with CryoTanks' dependencies (CRP + dynamic battery storage), it can be reproduced very easily. I don't think it has to do with CryoTanks' boiloff module, because I'm not testing on parts to which that module was applied (I think), but I guess that might be another possibility.

Anyhoo, to reproduce, simply install B9 Part Switch, CryoTanks, and CryoTanks dependencies with TweakScale on a clean KSP and:

• Place part in VAB.
• Place a fuel tank that has a B9 Part Switch tank switching module applied to it; use radial symmetry and place 2 or more of that tank.
• Tweak the size of one of the tanks in the symmetry group just created,
• Pick up one of the tanks, then place it again (still in symmetry), and
• The tank under the mouse (the one at the point of placement) will have the correct increased volumes, but all of its 'symmetry clones' (not sure of the right term there) will have incorrect volumes equal to the original volume of the part.

Just FYI!

The workaround is: don't pick up and re-place anything in symmetry after scaling.

B9PS is resettting the scales, and I think this will need a DLL PartModule to call TS again when someting on it changes, as (IIRC) B9PS issues messages when it needs things to be updated.

[Krazy0]

B9 part switch is also used by Better SRBs to change the fuel grain geometry. Changing that after tweaking the size results in stock thrust (according to the stock staging display and KER). So grain geometry must be changed before tweaking size. -Krazy1

[Lisias]

I need to do something soon™, as users are thinking on this a bug on TweakScale. See TweakScale/TweakScale#360