Rework indicators + Fast StochasticK Osc:

  - Rework SMA to support better external calling (will be useful with
    Stochastic %D style oscillators and more)
  - Run all indicators all the time, still only trade off one (see TODO)
  - Add a Fast StochasticK Oscillator
  - Rename StochRSI to StochRSIK as a preface to a StochRSID
    implementation