[BH-000] Commit database migrations for 2.10.0

Committed all the database migrations before
2.10.0 release.

[BH-2103][BH-2104] Add What's New entry for custom quotations

Added What's New entry for custom quotations. This is also
a second part of fix for BH-2104 - this entry is
intentionally added as a migration, adding it as a part of
revision 0 would not fix the issue.

[BH-2104] Create What's New database using migration mechanism

Create What's New mechanism using migration mechanism. This is
a first part of a fix for What's New not working if trying to
update from 2.9.0, 2.9.1 or 2.9.2.

[BH-2093] Add changelog entry

Added custom quotations changelog entry.

[BH-2096] Return error code when switching to empty quotes DB

* Added mechanics returning error code 406 Not Acceptable
when trying to switch to empty custom quotes database.
* Minor cleanups.
* Minor fixes in test script.

[BH-2099] Add synchronization of custom quotes with Center

Added support for sending a quotes database file and sending feedback
about custom quotes settings

[BH-2097] Adding and deleting a single custom quote

When deleting quotes, if the database is already empty, we switch to
predefined quotes.

[BH-2095] Add quote interval setting

Modifying the time after which new quotes are displayed on the Harmony
screen.

[BH-2097] Adding and deleting a single custom quote

Adding and removing custom quotes in the database sent by Center

[BH-2096] Add quote group setting

Adding a new endpoint for communication with Center;
Modification of randomization algorithm from a selected group of quotes.

[BH-2098] Add new table with custom quotes to the database

A new table has been added to the quotes database for user-added quotes.

[BH-000] Update Harmony 2.9.2 changelog

Update changelog after Harmony 2.9.2
release.

[BH-2100] Fix crash when seeking in large MP3 file

* Fix of the issue that seeking in large MP3
file would cause OOM error when creating
MP3 indexes. This caused OS crash when
looping large MP3 file in Relaxation.
* Minor cleanups.

[BH-2091] Remove timer from loop mode in Relaxation

* Removed timer logic that would refresh
the entire loop mode screen in Relaxation.
The contents of the screen doesn't change
unless there's a user activity or time
update, so the timer is not needed.
This should improve battery life in
Relaxation loop mode.
* Minor cleanups.

[BH-000] Update Harmony 2.9.1 changelog

Update changelog after releasing Harmony 2.9.1.

[BH-2085] Commit Harmony database migration

Committed settings database migration
required for Harmony 2 Pro.

[BH-2092] Change onboarding auto power off time

* Changed automatic power off time for initial
on/off onboarding screen.
* Removed unused onboarding welcome window.
* Minor cleanups.

[BH-2091] Change maximum focus time to 120 minutes

Changed maximum focus time length from
60 to 120 minutes.

[BH-2090] Fix blink when disabling Power Nap

Fix of the issue that frontlight would
blink for a second after light clicking
to stop ringing Power Nap.

[BH-2088] Add build stage for BellHybridPro

* Added PR build stage for BellHybridPro.
* Changed naming of update and flash
packages for Pro config.