[EGD-6434] Tethering icon updated

Added an icon for tethering.

[EGD-6209] Tethering confirmation popup added

Provided a tethering confirmation popup.
The popup shows up once a USB cable is connected to a PC.

[EGD-6311] Audio settings windows

Added windows for phone call, messages, calendar and alarm clock
vibration and audio settings.

[EGD-4734] Add PIN settings window

This window displays switch button for
disabling/enabling pin code for sim card.
Its also starting point for changing pin code.
Added actions for enabling and disabling
pin code for sim card.
Added method for checking if pin code is
set for sim card.

[EGD-6121] Add offline mode in service cellular

Adds entering and leaving ito offline mode in sevice
cellular. Outgoin SMS and calls are blocked Proper popups
are shown in applications Call and Messages.

[EGD-6351] Add Factory reset window

Add Factory reset window to Settings

[EGD-6361] Fixed quotation marks in Notes

Fixed quoatation marks in Notes so that they get reflected
and stored properly in SQL

[EGD-6268] Add SAR info window

Window contains detailed information about SAR and certification.

[EGD-6267] Create Technical Information Window

Add Technical Information Window to display tech info on Pure.

[EGD-6266] Create Certification Window

Add Certification Window to display certification information.

[EGD-6262] Refactor Quotes

- Connect QuotesMainWindow to work with agent,
- Use DatabaseModel in Quotes and Categories models,
- Connect add/edit/remove quotes with agent

[EGD-5260] Add A2DP playback to audio

Add basic playback capability using Bluetooth A2DP profile.
Only stereo/44100/16bit files are supported at the moment

Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com>

[EGD-6280] Further changes to Pure menu wording

Fixed 'Advanced' title.

[EGD-6280] Further changes to Pure menu wording

Fixed 'Advanced' title.

[EGD-6280] Further changes to Pure menu wording

Added small fixes to the wording before sending phones to testers

[EGD-6264] About Your Pure Main Window

Add window About Your Pure to help display Technical Information,
Certification and SAR.

[EGD-6282] Add marketing-friendly test messages to Pure

Added a long 4K note from a book and Mudita-related.

[EGD-6282] Add marketing-friendly notes

Added a marketing-friendly notes and a 4K chars passage
from 'The Picture of Dorian Grey'.

[EGD-6277] Changed contacts to English names

Changed contact names and contact details to 
more marketing-friendly.

[EGD-5743] Added phone modes popup

Implementation of phone modes window.
Minor fixes of previous approach.