Merge remote-tracking branch 'origin/master' into develop

util/install/gentoo.sh

···
     echo "sys-devel/gcc multilib\ncross-arm-none-eabi/newlib nano" | sudo tee --append /etc/portage/package.use/qmkfirmware >/dev/null
     sudo emerge -auN sys-devel/gcc
     sudo emerge -au --noreplace \
-        app-arch/unzip app-arch/zip net-misc/wget sys-devel/clang \
+        app-arch/unzip app-arch/zip net-misc/wget llvm-core/clang \
         sys-devel/crossdev \>=dev-lang/python-3.7 dev-embedded/avrdude \
         dev-embedded/dfu-programmer app-mobilephone/dfu-util sys-apps/hwloc \
         dev-libs/hidapi