refactored code to use a factory function for color schemes
fixed some typos and JSDocs
added color schemes for brain visualiser
renamed colorPicker to colorScheme;
added independent html and css files for color scheme;
added JSDocs and improved code
reorganised code to be more generic; added color scheme support in connectivity visualiser
added color scheme on all visualisers
added function to disable the color scheme
fixed small bugs with linear color scheme
refactored code:
* removed duplicated colorpicker inclusion
* single function for updating legend colors and labels;
* added a common css for all visualisers; removed inline styles
* fixed duplicated jQuery selectors
* fixed typos in code
Add color scheme changes on top of upstream ones and merge files.