Web imports (#474)
* use .unit-input
* use .fft-select
* radio button checked
* use .fft-input
* clkgenInputs
* rm dependency to Control in plot
* rm fftWindowIndex
* use clkgenInputs for setSamplingFrequency
* use .fft-channel-input
* use .precision-dac-input
* use .precision-adc-span
* use .supply-span
* rm redundant toFixed toString
* use .temperature-span
* yUnit
* use imports
* fft.css and imports
* use imports
* use imports
* rm functions.ts
* group temperature-sensor
* group
* group
* group
* group
* rename control to fft-app
* mv export-file
* navigation
* group
* imports in ts
* mv imports.ts, navigation.html to web/
* redpitaya fft
* rm duplicate
* use .laser-control-input
* rm control.ts
* switch mode updates data-command
* laserControlInputs range max
* initLaserModeSelect()
* laser-control.html
* mv css to main.css
* use imports and initAverageSwitch()
* average
* modulation.ts
* import modulation
* spectrum
* initVelocitySwitch()
* laser controller
* mv dds-frequency
* export-file.ts
* minor
* minor
* rm resetRange()
* rm plot_data construction from redraw
* max_x as arg
* break down plot / plotBasics
* mv plotBasics
* plotBasics arg driver
* rangeFunction
* break down in oscillo
* spectrum
* minor
* fft plot
* use polyfill HTMLImports
* use imports pulse-generator, led-blinker
* import plot-basics.html
* mv imports.ts in koheron.ts and download polyfill
* group nav html ts, default in os.mk and web.mk
* replace with simpler navigation
* mv led blinker to web/
* update SDK version to 0.17.1 and instruments version
* fix export plot
* update version to 0.18.0
