Build kdeconnect on sailfish and port some simple plugins

Summary:
Below is a lost of the commits, but, in summary
Port the build system for Sailfish, which means selectively building only the bits we need/can, and only against the KF5 libs that are available.
Allow to build on Qt 5.6
Switch from knotification to nemo notification (not complete!)
Add a very simple example sailfish app.

Note, there is still much missing functionality. Notifications dont work, pairing sort of works but not really, but when it is paired you can send a ping to the desktop client

Dont build kio for Sailfish

Port core build system

Port daemon buld system

Require CoreAddons on Sailfish

Port plugins build for sailfish and include the ping plugin for now

Final build changes for sailfish.

Disable tests and other not needed parts

Add includes for QCA

Fix build errors on sailfish

Get core/ to build on sailfish

Get interfaces/ to build on sailfish

Build daemon on sailfish

On sailfish, dont install the kcm file

Start port plugin to sailfish

Fixup installed files

Add sfos app

Hack declarative plugin to give a public interface

Build sfos app

Compile declarativeplugin into the sfos app for now

Redefine qAsConst for qt 5.6

Packaging fixes

Use official icon

Package .desktop

Reviewers: KDE Connect, apol, nicolasfella, albertvaka

Reviewed By: KDE Connect, apol, nicolasfella, albertvaka

Subscribers: kdeconnect, andyholmes, albertvaka, kossebau, mtijink, vonreth, apol, KDE Connect, nicolasfella

Tags: KDE Connect

Differential Revision: https://phabricator.kde.org/D10703