Reduce bandwidth when too far away

[supermerill]

Hi
With the current version of RT, the bandwidth for transmission of experiments is full if in range, and 0 if not in range.
I created a poc to add an intermediate state where the bandwidth is reduced, so transmit the experiment take more time and more energy.

I play with the RangeModelType set to additive (with a big ground station range). With this addition, i can transmit command if the vessel is in LOS, but transmitting a experiment result need a good antenna (or be near) to not drain all my energy.

I modified the ModuleRTDataTransmitter to pick the signal path and calculate the bandwidth and each link, and keep the lowest. To calculate the bandwidth, if an antenna is out of optimal range: the bandwidth is multiplied by (distance/optimalDistance)²
Example: With a 30km antenna, an experiment transmitted at space need 6 time the energy than at groung / low atmosphere. Deploying a better antenna for the transmission is useful.

I think it's a nice addition for the additive mode.

poc: https://github.com/supermerill/RemoteTech/tree/merill_reducePacketSizeWithDist
ps: if you are interrested, i can make a more refined code (with parameter to activate it) to create a pull request.
pps: i do this for my mod.