Dark mode

[Commanderk3]

[Work in Progress]

I just want to make sure that whether this approach is good or not. Many of the colors in MB are derived from platformstyle.js
Modifying this file will require less hardcoding to change the theme to dark mode. When you toggle to dark mode the user has to reload the website to observe the changes. This is similar to how changing of languages works. With this PR, the isDarkModeON is stored locally (like beginnerMode). When the website starts it checks if isDarkModeON is true, if yes then it initializes a different set of colors (in platformstyle.js)
Of course there are some elements whose color is not defined by platformstyle.js . For them I guess we can define there color specifically.

@walterbender What do you think ?

The colors for dark mode can be better I guess.....

[walterbender]

Mostly kind of works. The palette buttons should prob. not change to black on blue. The palette background should not be white. The block colors themselves should probably be adjusted, esp. if the label text is now white.

[Commanderk3]

Mostly kind of works. The palette buttons should prob. not change to black on blue. The palette background should not be white. The block colors themselves should probably be adjusted, esp. if the label text is now white.

Noted 👍