New Targets:

. STM32L4
    STM32L476xC
    STM32L476xE
    STM32L476xG
    STM32L486xC
    STM32L486xE
    STM32L486xG

. STM32F3
    STM32F378xC
    STM32F398xE
    STM32F303xD
    STM32F303xE
    STM32F302xD
    STM32F302xE

. STM32F7
    STM32F745xE
    STM32F745xG

. STM32F4
    STM32F469xE
    STM32F469xG
    STM32F469xI
    STM32F479xE
    STM32F479xG
    STM32F479xI

Improvements:

. New default startups for all STM32 devices
. Remove obsolete external datasheets (for smaller disk usage)

Fixes:

. Correct management of devices that do not have a default startup.
. Import project Keil: exclude from build and link asm (.s) files.
. Correct Open4 Firmware update.
. Correct programming of STM32L0 Option Bytes (was failing on some
  systems).