power up selection code rewrite

rewrite of the tech,gun,field selection code
  odds of new bugs is pretty high, but the code is shorter and faster, so easier to fix
path integral is no longer a JUNK tech
  lets you choose from every option on next tech
emergence is stackable
  +2 power up choices per stack

tech: integrated circuit - if ON +7 power up choices  if OFF -1

update matter.js engine 0.17.1 -> 0.18.0
  shouldn't change anything
big fixes

lib/matter.min.js

@@ -1,6 +1,6 @@
 /*!
- * matter-js 0.17.1 by @liabru
+ * matter-js 0.18.0 by @liabru
  * http://brm.io/matter-js/
  * License MIT
  */
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