Major graphics refactoring

**Majority of the graphics for the project was refactored, i.e., redesigned / enhanced / remade.**

## Logo
The main logo now looks much more consistent and smoother! Both vector and pixel versions of the logo were redrawn.

## Application Icon
The application icon was remade from scratch. Not only it now looks better and cleaner, but thanks to the brand new vector version of this icon, we are now able to make it fit any desired resolution!

## Project Structure
A new directory (namely _"~/**gfx**"_) was made to be used as a storage for all artworks, sketches and/or experiments related to project's graphics.
All graphics unrelated to Cypherfox Chrome client was already moved to the directory mentioned above (also, all links to such graphics were appropriately reviewed).