Fix electron-builder failing on linux .deb package

Add 512x512 icons to fix electron-build for linux

Update electron-builder.json

Add icon files with correct dimensions to fix electron-builder fail for linux deb package. Requires minimum size of 512x512. (see https://www.electron.build/icons)

Provide correct path to build icons. The path must be a directory and not pointed to a filename.

build caches and portable package names

* added install stage in appveyor

* added install stage in appveyor2

* packaging for Windows

* configure appveyor file for windows packaging

* modify daemon path

Add transaction fee to send confirmation

Update to Angular 5, prepare for electron-builder

Switch to cancel button

Add mnemonic verification, switch to blue logo everywhere