All icons are moved to separate project

#### Purpose

Move icons to separate project.

#### Additional references

[MAGN-4582](http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-4582).

#### Reviewers

@aosyatnik, please take a look.
Hi @aosyatnik, I think we don't need to create build dependency for the new project. We can build *.resources.dll anytime in the build process, right? It's independent of other components.