v1.15-beta.0

feat: make lmem assignment stage more analyzable

- define some commonly used LOG macro (Logger.h)
- define some strinify function to show lmem type and timestep mode
  (LayerGroupDefs.h)
- add show_timestep_table to print readable timestep table
  (BasicTimeStep.h/BasicTimeStep.cpp)
- add many DEBUG_WITH_TYPE logs and comments in lmem assignment stage
  (BasicTimeStep.cpp/LmemAllocator.cpp/TimeStepMethod.cpp/SwPipeline.cpp)
- rename some variables and function names for better represent the
  process(gen_all_mem_buffer_ts/tgt_min_address/...)
- reduce assignLmemAddr cyclomatic complexity.(LmemAllocator.cpp:989)

Change-Id: I31dadb9424be334da481f9dfbd45985ca89dc058