[PATCH] enhance the civ specific techs affecting max health of buildings

[mimo]

Now that capture is the most used way of attacking a building, the civ specific techs which modify the max health of buildings have lost most of their usefulness while they were a way to differentiate civs. I propose to modify them to also affect the max capturePoints of buildings. See the attached patch. I've kept the same multiplicative factor as for the max health, but that should be tuned for balance.

[leper]

The round is needed for some possibly strange values? Looks good, balancing would be needed but seems like a nice point to start from.

[Itms]

It would also be nice to update the tech descriptions.

[mimo]

Yes, I was also a bit hesitant to add the rounding, but I guess a capture point of 750 with a multiply factor of 1.25 is something which could happen, so better have it. I'm going to update some tooltips, and then I'll commit it.

[mimo]

In 16852:

modify also capture points in the civ specific techs affecting structure health, fixes #3333