build: W600-SDK importiert, Firmware-Build und Hello am EVK

Docker-Build mit gcc-arm-none-eabi 4.9-2014q4 (statt Homebrew-Cask) verwendet,
Dockerfile/tools/docker.sh dafür aus Task 13 vorgezogen. cmake/sdk.cmake schont
gcc 4.9 (kennt -fcommon/-Wno-error=... nicht). Zwei zusätzliche SDK-Stubs
(EarlyInit, pre_gpio_config) in src/sys/sdk_stubs.c ergänzt, siehe sdk/PATCHES.md.

sdk/Platform/Common/wm_common.c

@@ -0,0 +1,11 @@
+#ifndef WM_COMMON
+#define WM_COMMON
+#include "../Platform/Common/fwup/wm_fwup.c"
+#include "../Platform/Common/task/wm_wl_mbox.c"           
+#include "../Platform/Common/task/wm_wl_task.c"           
+#include "../Platform/Common/task/wm_wl_timers.c"         
+#include "../Platform/Common/utils/utils.c"               
+#include "../Platform/Common/crypto/wm_crypto_hard.c"
+#include "../Platform/Common/mem/wm_mem.c"  
+#include "../Platform/Common/Params/wm_param.c"  
+#endif //WM_COMMON