Allow tech filtering in Sandbox mode

[Spheniscine]

It would be useful if you could limit your parts by tech tree (temporarily of course) in Sandbox mode. This makes it easier to build a deliberately low-tech design, whether as a test for Science or Career mode, as a self-imposed challenge, or simply a way for new players to dripfeed themselves into rocket design without being overwhelmed by all the part choices. (I'm aware there's Science mode for the third bit, which is what I did. I soon moved on to Career mode though, and found it so much fun I stuck with that until I surpassed my current progress in all my Science mode games, forcing me to use the Wiki to plot out the rest of my tech advances.)

Edited October 27, 2014 by Spheniscine

[ringerc]

Sounds great to me, especially if it was a quick and easy Level 1, Level 2, etc, not individual tech selections.

After all, getting to Mars with an asparagus clump is awesome.