Build 1

Planned features:

Improve UI
Add more beams
Improve centerpoint for rotation of selected beams
Add snapping for moving
Make choosing an attachmentpoint better (skip essentially identical ones)
Allow placing w/o snapping
Allow rotation of specific amount (45? 90?)
Improve multiple keys to prevent X firing on Y-X
Copying and pasting

Known bugs
Beams can be placed inside each other
Beams can be moved into each other