[EGD-5984] Add BT implementation of added GUI actions

Implemented BT-side actions for GUI usage, e.g. connection status

[EGD-5912] Add forget bluetooth device feature

Added button on AllDevices window, and handling for it.
Added needed messages for communication with service bluetooth.
Feature is now complete on application settings side.
Further integration in service bluetooth is needed.

[EGD-5861] Complete bluetooth connecting process on settings side

Enable connecting BT devices in settings.
Connect popup and add adjust messages for connection error handling.

[EGD-5764] Implement handling multiple BT profiles

To be able to connect to the BT device with more than one audio
profile, we need something to manage those profiles. Created here
ProfileManager made it convenient
To be able to work properly with BT, CPU freq has to be at least
at Level_5 - to be fixed!

[EGD-2634] Add pairing process result confirmation

Enable pairing BT devices in settings.
Connect popup and add adjust messages for pairing error handling.

[EGD-5737] Merge master into experimental

Synchronize with master before merging

[EGD-4339] Refactor AllDevices and PhoneName windows

Rewrote these windows in a proper way.
Fixed few minor issues.
GUI adjustments.

[EGD-4340] Refactor bluetooth settings and add device windows

Rewrote these windows in a proper way.
Fixed few minor issues.
GUI adjustments.

[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-5480] Bluetooth scan refactor

There was a need for Bluetooth scan code refactor. Here it is

[EGD-5158] Change access to the bus methods

The bus is now accessible only via Service object.

Merge branch 'master' into stable

[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.

Merge branch 'master' into stable

[EGD-5087] Update Options and replace PageLayout with ListView

PageLayout removed and replaced with ListView.
Options structure and namespace cleanup.
Added ListView ScrollBar type and disable on
construction.

Merge branch 'master' into stable

[EGD-4580] Add BT settings middleware

Added bluetooth settings middleware to store BT status in settings.
Added middleware layer to handle new settings queries.

[EGD-4925] Change new filesystem handling implementation in module-gui. (#1193)

Due to vfs deprecation there is need to remove all vfs calls from code. This PR covers module gui. There are some modifications in other modules included which are necessary because of build system issues.