[EGD-3119] Hide InputEvent's member fields

Use the InputEvent's convenience methods to express intent.

[EGD-6642] Fix googletest gui

Fix Unit Tests: googletest-gui.

[EGD-6456] ListView based desktop notification

This PR provides following changes in notifications:
- notifications were extracted as widget for pop-up-based
locked-screen implementation
- notifications are ListView based implemented
- the most recent notification is displayed on the top of the list

[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-3649] Fix paths in UT

Reorganization of assets left path in UT outdated.

[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-6534] TextFixedSize crash on char removal fix

Fixed TextFixedSize character removal crash on single line
space case. Added UT to cover it and other missing TextFixed
sized drawLines cases.

[EGD-5567] Add code coverage reporting

Add HTML and XML code coverage report generation with gcovr.

Cleanup unittests list - add missing googletest-gui to the unittests
list; remove dead functional tests.

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

[EGD-6415] Do not silently crash on empty image name

Image should not silently crash with empty or incorrect image name.

[EGD-5966] Fix unit test build linker error

Problem was created by not extending `VisitorMock`
to mock new method of abstract `GuiVisitor`

[EGD-5860] Fix build packages

Merging and cleaning cmakes requred cleaning.

Merge branch 'EGD-5737-merge-master-to-exp-lbr-fix'

[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-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-5145] Fix remove vfs include from UT

Deprecated vfs is no more accessible. Deleted old includes.

[EGD-5088] Change new filesystem implementation

Removed deprecated vfs calls from all applications.