[MOS-686] Fixed MTP availability only after phone unlocked 2

This is fix for Windows. It's fix for previous fix witch:
Fixed file access via MTP even when phone is not unlocked.
Now access is granted when the phone is unlocked by the user
entering a passcode. If the phone is not passcode protected
(passcode is nor set) then access to the files is always possible via MTP.

[BH-1702] Fix RTWDOG main DCDC reset

Fix of the issue that RTWDOG performed
only CPU reset in case of timeout due
to IRQ misconfiguration resulting in
RTWDOG handler not being called.

[BH-1673] Fixes for Harmony random resets

Next part of Harmony random resets fixes:
* added RC OSC startup delay as in newest lpm.c;
* changed order of clock source, oscillator and
LDO switching;
* removed connecting internal DCDC load resistor,
as it is only required to speed up converter
startup after it was turned off completely;
* changed DCDC operation mode to continuous
conduction;
* set low VDD_SOC_IN voltage back to 950mV as
suggested in RM.
* added switching DCDC converter mode to
discontinuous conduction for two lowest CPU
clock frequencies, as using CCM mode resulted
in very high current consumption that would
shorten Harmony's life on battery
significantly.

[BH-1700] Add date and time to logs at the startup

Save date and time at the startup of the system for analysis purposes.

[MOS-993] Logger bug fixes and optimizations

Fixes and optimizations in logger:

* fixed possible buffer overflow when logging
logs over line buffer size;
* reduced max log line length to 2048;
* moved pubsetbuf before file opening;
* log file stream buffer created once
in logger ctor;
* updatet UTs;
* additional minor cleanup.

[MOS-973] Fix for a ghost call after quick click back key to end a call

Fixed a scenario where the user click to make a call to some contact and
then quickly click BACK (right function button) to end the call and despite
that Pure was still calling without showing any information.
This fix prevent to handle key press event as a key longpress even after
application lose a focus, or change a state.

[BH-1691] Fix battery and date layout

Fixed battery and date layout for Harmony

[BH-1673] Harmony random resets fixes

* Switching VDD_SOC_IN only after PLL2 is turned off.
* Weak LDO stabilization delay.
* Removed switching to 1.275V before frequency change.
* Cleanups in LDO switching.
* Removed switching PeriphClk2Div for fCPU <= 24MHz,
using AhbDiv instead.
* Removed log from _exit that caused logger mutex deadlock

[BH-1690] Add information about the connection to the PC

Added text with information about the connection to the main window
when the USB cable is connected to the PC

[MOS-686] Fixed MTP availability only after phone unlocked

Fixed file access via MTP even when phone is not unlocked.
Now access is granted when the phone is unlocked by the user entering
a passcode. If the phone is not passcode protected (passcode is nor set)
then access to the files is always possible via MTP.

[BH-1695] Fix Harmony crash on startup

Fix of the bug in PWM driver that
resulted in accessing array out of
bounds, what caused occasional
system crash on startup.

[BH-1595] USB reset procedure

* Fixed incorrect reset procedure
* Minor refactor

[CP-1966] Deleted file which is played does not stop the playback timer

Fixed the timer issue when file was deleted during playback.

[CP-1974] Deleting all templates leaves some text on pure screen

Additional fix, previous one was not working correctly in all scenarios.

[BH-1691] Change the layout of the battery status

The new layout of battery status has the battery
SOC on the left side and battery image on the right.

[BH-1693] Correct SDRAM timing settings according to chip RM

* Corrected SDRAM timings in T6 JLink script.
* Cleaned-up and commented JLink script.
* Bumped bootloader version.

[BH-1694] Increase CPU core voltage from 900mV to 975mV

Previous voltage setting was lower than the one
suggested in RT1051 RM and would lead to CPU
instability in certain conditions.

[MOS-975] Fixed missing new message notification

New message notificationis not cleared on locked phone
when phone was locked from thread window.

[MOS-578] Fix misleading SMS notification text

Display "New message", translated accordingly - in
singular - in case there had been multiple unread
SMS messages and now only one remains unread.

[CP-1974] Deleting all templates leaves some text on pure screen

Fixed Template window clearing after all templates are removed.