APP: Log level related changes.
APP: Log level related changes.

Added log level control. Fixed log level set. Updated silent mode to use loglevel silent.

shangdawei/LibSWD,shangdawei/LibSWD,cedar-renjun/LibSWD,ongjohn/LibSWD,cedar-renjun/LibSWD,shangdawei/LibSWD,cedar-renjun/LibSWD,ongjohn/LibSWD,ongjohn/LibSWD