[BH-353] Add minimal build target for BH

Introducing changes required for adding BellHybird target without
removing PurePhone.
Adden new targets:
* Pure (builds PurePhone and PurePhone.img)
* Bell (builds BellHybird and BellHybird.img)
* [PurePhone|BellHybrid]-[UpdatePackage|StandaloneImage)

[BH-371] Replace gsl with mainline submodule and move to third-party

Replacing loose gsl files with gsl mainline project as submodule
and moving it to third-party

[EGD-6835] Fix UT link errors with inotify

Fix UT linkage error when trying to link with
libiosyscalls with inotify mechanism

Signed-off-by: Lucjan Bryndza <lucjan.bryndza@mudita.com>

[EGD-5976] Add tethering cellular disabling

This commit adds disabling of URC messages during
tethering mode. It also adds call and sms logging after
tethering is disabled.

[CP-77] Replace receivedAt and sentAt fields with createdAt

sentAt json field was never updated and was not used.
Cleaned up DB and DB interface from unused date_send.

[EGD-5171] Utils to string fix

Fixed utils to string function to work with 8 bit integers.
Also nodiscard attribute added there.

[EGD-6767] Disable WALL mechanism in the DB

Wall mechanism is not needed due to the littlefs
fail proofs safety. It causes a lot of troubles
in the frame recovery and unnessesry increases
io bandwidth

Signed-off-by: Lucjan Bryndza <lucjan.bryndza@mudita.com>

[EGD-6707] Add single number message notification

This PR provides implementation of home screen notification for
`notSeen` messages received from a single number. The "single-number:
`notSeen` message notification distinct from "multiple-number"
notification with the following features:
 - displaying formatted contact name
 - `onActivated` it switches to respective thread window (instead of
 all thread window) in `ApplicationMessages`

 The PR also introduced some `ActiveNotificationsModel` code refactor
 to align the implementation with `Single Responsibility Principle`

[EGD-5512] Don't log pragma errors

Ignore false pragma errors caused by our VFS and sqlite.

[EGD-6599] Add single number call notification

This PR adds proper notification on call notifications coming from
single number. To that end following changes have been introduced:
 * extension of Notification DB record with contact_id filed
 * use of `ContactRecordInterface` in `NotificationsRecordInterface`
 * extension of `Increment` query to require `PhoneNumber::View`
 * multiple minor changes on path from creating/handling
 `NotificationsRecord` to displaying respective notification.

[EGD-6680] Notes crash fix on search

Changed query for all matches to query with limit

[EGD-6645] Fix ContactGroups tests

Fixed Contact Groups tests.

[EGD-6650] Fix Thread Record test

Fix UT for using WAL in SQLite.

[EGD-6648] Fix Events Record tests

Update UT for work with SQLite WAL.

[EGD-6643] Fix Alarm Record tests

Fix UT Alarm Record to work with WAL in SQLite.

[EGD-6649] Fix SMS Record tests

Fix UT for WAL in SQLite.

[EGD-6644] Fix Alarms Table tests

Fix UT for supporting WAL in SQLite.

[EGD-6646] Fix Contact Record db tests

Clean  WAL file after db init

[EGD-6110] Cyclic db write

WAL option used, checkpoint set to 1

[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