[EGD-5884] Added Lock Screen popup handling

Moved lock screen window to popup. Split DesktopMainWindow into
two parts (popup and regular). Added LockPhoneHandler into
ApplicationManager.

[EGD-3119] Hide InputEvent's member fields

Use the InputEvent's convenience methods to express intent.

[EGD-6495] Add pause/resume/stop to MP

Added basic Pasue/Resume/Stop actions to confirm
that related Audio service operations work

Added handling of headset OK for Pause/Resume/Stop actions
while in Music Player

[EGD-6527] Internationalization API unification

Single api to rule i18n
all calls to localistaion in cpp files unified
cut off ass many dependencies in i18n header as possible

[EGD-6555] ListView constants move

ListView constants moved from style to ListView.hpp.

[EGD-6552] Options cleanups and fixes

Fixed options crashes and cleared its structure. All
options returns points to proper list indexes.

[EGD-6494] Application Manager on action switch fix

Application Manager switch on Action no longer causes to
newly opened application main window switch but it
calls declared action handler.

[EGD-6347] Refactored phone modes handling in applications

PhoneModeObserver doesn't work properly in applications.
Applications have to handle the phone mode changes via AppMgr.
Phone mode and tethering handlers separated.

[EGD-6208] Add blocking phone mode changes during tethering

When the tethering is enabled, the phone mode shouldn't change,
now, any attempt ends with a notification

[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-6262] Refactor Quotes

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

[EGD-5743] Added phone modes popup

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

[EGD-5712] Volume popup added

There is need of popup window on volume key
pressed event. This PR handles:
Creating base popup window attached to
application desktop.
Creating volume window.
Audio key events logic implementation.

[EGD-5973] Reduce audio stack usage

Verify stack usage of:
 - ServiceAudio
 - application music player
 - decoder worker
Change if possible to a realistic value keeping a 30% margin.
Stack usage reduction is limited due to an extensive stack usage of
every call to the filesystem, which uses around 2 kB of stack.

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

[EGD-5883] Added generic button popups attach to applications

Created structure and implementation for popup windows
attachments on button actions into applications. Moved Volume
window to fit into solution. BarGraph refactored.

[EGD-5983] Remove volume label from music app

Removed volume label from application music player.
Volume level should be shown using new popup system.
Introduced minor fixes in music player.

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5772] Add pause/resume API for media player

Simple version of pause / resume APIs has been added
for media player.