change HarParser from Singleton Class to simple module
add waitTime setting type support.Depends on the timeSettingType, config
the timings of each resource:
   1. timeSettingType is FROM_HAR, do not change the timings get from
har file;
   2. timeSettingType is SAME_CONFIG, change "wait" value in timings to
waitTime get from config;
   3. timeSettingType is AVE_VALUE, change "wait" value in timings to
average value of those get from har file;
   4. timeSettingType is ASCEND_SORT, ascending sort the "wait" value in
timings get from har file; (TODO)
   5. timeSettingType is DESCEND_SORT, descending sort the "wait" value
in timings get from har file. (TODO)