Shield regenerator tweaks

[Tenryu]

I've done two things with Shield Regeneration in my personal mod I'm trying to make compatable with the TDM AIs. I mess with the components, compenhancements, tech area, and vehicle sizes files, then see if the TDM AIs will play nice with the changes.

Maybe some of you might find it interesting.

1. I added the SHIELD REGENERATION ability to my Phased shields. The values are 2, 4, 6, 8 for Versions I, II, III, and IV, respectively.

2. I added the Restriction, One Per Ship, to the Shield Regenerators. They have the regen values of 50, 75, 100, 125, 150, and become available at Shields Research Levels 2, 4, 6, 8, and 10.

I'm about to play a game with them. I think the AI will use them, as expected, and without trouble. I like them because I think they will be useful and in the game earlier without being overpowering.