Reduce indentation where possible
Proper variable scope

Don't let instances fall through when we fail

Prefer using smart pointers or parenting to manual deleting

Summary:
This Patch brings the following fixes:

   *  Now It shows proper release data.
   *  Now showing proper size.
   *  added a default icon for updates (device-notifier)
   *  fixes some end-case

Reviewers: apol, davidedmundson

Reviewed By: apol

Subscribers: ngraham, plasma-devel

Tags: #plasma, #discover_software_store

Differential Revision: https://phabricator.kde.org/D14649

* Brings uniform variable name and spaces between function.
* Changed License in findLIBFWUPD.cmake as per discussion here (https://phabricator.kde.org/T9305)

Summary:
This patch brings the initial integration of Fwupd Backend.
    * This backend was implemented as the part of my GSoC"18 Project, its link can be found here:

    https://summerofcode.withgoogle.com/projects/?sp-search=abhijeet#5140246090481664

    * The status report for this backend can be found here:

    https://community.kde.org/GSoC/2018/StatusReports/AbhijeetSharma

Reviewers: apol, davidedmundson

Reviewed By: apol

Subscribers: zzag, anthonyfieroni, plasma-devel

Tags: #plasma, #discover_software_store

Differential Revision: https://phabricator.kde.org/D14050