[pkg] windows helper and qtinstaller

Makefile

bitmask.pro

branding/qtinstaller/config/config.xml

branding/qtinstaller/packages/root.win_x86_64/.gitignore

...tinstaller/packages/root.win_x86_64/meta/installscript.js

...ing/qtinstaller/packages/root.win_x86_64/meta/package.xml

branding/qtinstaller/packages/root/meta/package.xml

cmd/bitmask-helper/main.go

gui/backend.go

gui/handlers.cpp

gui/qml/main.qml

pkg/bitmask/autostart.go

pkg/bitmask/init.go

pkg/helper/helper.go

pkg/helper/windows.go