[Feature request] Add light version of Gruvbox about gruvbox-intellij-theme

[Vincent-P]

I merged the PR and fixed a few colors, light versions are on master!
I'll publish an update once other issues are fixed.

[mariushelf]

I have created a basic light version here: https://github.com/mariushelf/gruvbox-intellij-theme/tree/light-version
I have simply searched for usages of "dark" colors as defined in the original vim schema, and replaced them with the respective light versions.
There are a few colors used that are not defined in the original vim schema. I am not sure on how choose good light colors. Any input is very much appreciated.
Also if @Vincent-P would like to adopt my branch I'm very much open for it.

[Vincent-P]

Not planned at the moment.
If someone wants to try to do it I gladly accept PRs.

[mariushelf]

After some more tinkering, it seems that the only unmapped color is now f8e1aa, e.g. for brackets and the selected indentation line. Lacking a better option I've just removed that color. PR coming your way soon :)

[mariushelf]

#26