strategy designer

[mr-highball]

currently a "canned" set of strategies are glued together via native code and can't be changed (aside from the limited parameters supplied by ui or json config). need a way for users to "build" a custom tailored trading strategy through the UI and have this added as a tab for them to use/backtest.

for this to happen need to:

• redo strategy persistence
• update the strategy tab to support multiple tabs
  • selection will "activate"
• todo - more...