Replace memanalyzer with python script

[slaff]

The current memanalyzer tool is available on platforms that have .NET support which increases the dependency of external tools and libraries. Because we already have dependency on python (esptool.py depends on it) and it is available on all supported OSes (Windows, FreeBSD, Linux, MacOS X) it would be a good idea to create a python script that produces output as memanalyzer and allows us to do more fine grained calculations as free heap, heap start address, stack start address, available memory space between heap and stack, etc.

#Memory / Section info:
------------------------------------------------------------------------------
   Section|                   Description| Start (hex)|   End (hex)|Used space
------------------------------------------------------------------------------
      data|        Initialized Data (RAM)|    3FFE8000|    3FFE8374|     884
    rodata|           ReadOnly Data (RAM)|    3FFE8378|    3FFEA0B8|    7488
       bss|      Uninitialized Data (RAM)|    3FFEA0B8|    3FFF0F70|   28344 (+8)
      text|            Cached Code (IRAM)|    40100000|    40105D46|   23878
irom0_text|           Uncached Code (SPI)|    40209000|    40244AFA|  244474 (+32)
Total Used RAM : 36716
Free RAM : 45204
Free IRam : 8908
------------------------------------------------------------------------------

Plus we will have consistent output for all supported OSes. As a start we can use PR #753 from @cmarrin.