threeBrain 0.2.9

This version plans for a major update. Here are some highlights:

Electrode localization can be done from original CT instead of re-sampled ones
Completely isolate JavaScript engine from R code. The JavaScript code is available as npm package and is used via sub-module
Implemented file readers directly from JavaScript, this allows reading files directly in viewer, and no cache is needed
No home-brew version of threejs is required: standard npm distribution is used
New controller GUI is implemented
The viewer can be driven via JavaScript directly via event dispatchers
Anatomical segmentation map is visible from the side panels; the voxel values are displayed when setting crosshair

Detailed Changes

Added step size in datacube2 material uniforms
Upgraded threejs to r148, and use npm distribution "three"
Massive code re-factory (variable names, trackball controls, legacy classes...)
Removed data-GUI and use lil-GUI
Fixed compass (finally...)
Added title to the viewer
Reworked the whole message signal system, added ThrottledEventDispatcher.js
Added MouseKeyboard class to track mouse and keyboard events, greatly reduced canvas burden
Added animParameter object to canvas to keep track of the animation parameters
reworked shiny drivers
fixed one-voxel shift issues
Added format support for nii, mgh/mgz, FreeSurfer surface, FreeSurfer node value binary formats
Added function threeBrain to allow 3D viewer to run without cache (with fs only)
Fixed memory leak issues in JavaScript code
Geometry groups can now change its storage path
JS is completely independent now (available on npm now)
Peel event dispatcher from the canvas class so the events can be managed separately
Hide time-stamps when there is no data/animation available
Added experimental support to show labels on regular electrodes; currently no depth-test is turned on
Added GUI support to change electrode label visibility and size
Electrode label size adjusts along with electrode radius
handle_resize now put off resizing function when detecting widget size is too small