Added new top level menu for customization of views In the previous versions all menus were occupied by menu option. To indroduce the selection views for data visualization a new tab had to be added. The menu "Customize views" has been moded to the new tab but not yet removed from the previous one. In addition a view for selection of big font options has been added (including multilanguage strings and other infrastructure)

Imported from Ac6/SystemWorkbench/plugins/fr.ac6.mcu.firmware_1.14.7.201711101414/resources/builtin/:
* File syscalls.c