[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-5332] Fix heap size and other merge fixes

After merge with master we are unable to run any application
It was caused by the insufficent heap size

[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-5737] Merge with master

Keep experimental up to date with changes from master

[EGD-5098] Fix and remove old vfs class

Fix and remove global vfs object remove all old data
included in the vfs.hpp class

[EGD-5088] Change new filesystem implementation

Removed deprecated vfs calls from all applications.

[EGD-5090] Add Brownout GUI window

Gui window will appear due to brownout
event. System shutdown will be also called.

[EGD-5325] Remove using namespace directives from headers

"Using namespace" directive should not be added in headers
because this practice pollutes source files.

[EGD-5215] Add APNs list

Load APNs from service cellular.
Add ApnSettings model.
Connect ApnOptionWindow with ApnSettingsWindow.

[EGD-4960] lockScreenPasscodeIsOn is a global setting

[EGD-4960] registerVariableChange moved to Init section of apps

[EGD-4960] Settings Interface added parameter do distinguish global/app settings
[EGD-4960] global/local setting determined by enum value, unregister all variables in one call, ut updated
[EGD-4960] SettingsScope usage in SettingsMessages

[EGD-5347] Save/load brightness mode

Properly display mode as OnOff switch on screen.

[EGD-5175] Fix grid layout navigation

Fix grid layout navigation in order to recognize
"not active" items

[EGD-4801] Add application-wide top bar manager

Applications configure the top bar once for all their windows.
Sometimes, windows need to configure top bars with its configuration.

[EGD-4417] Fix operations in calculator

1. Fix possibility to write illogical operations.
2. Fix possibility to write multiple '0' when it is not needed.
3. Add scientific notation when result do not fit on screen.

[EGD-5338] Add APN options window - gui

This is just GUI, window is not connected yet.
It will facilitate further development of APN settings,
and will be enhanced later.