This updates the heap management library, umm_malloc, to the current upstream

version at https://github.com/rhempel/umm_malloc. Some reorganizing and new code
was needed to use the new version.

This is a list of note worthy changes:

UMM_POISON - now has a lite option as well as the previous intensive check
option. The code for running the full poison test at the call of the various
alloc functions was removed in the upstream version. In this port the missing
code was added to heap.cpp and umm_local.cpp.
* UMM_POISON - appears to have been partially changed to UMM_POISON_CHECK,
  I treat it as depricated and used UMM_POISON_CHECK, when needed.
  However, the Arduino Core's references to UMM_POISON were replaced with
  UMM_POISON_CHECK_LITE.
* UMM_POISON_CHECK_LITE - Less intense, it just checks poison on active
  neighboring allocations.
* UMM_POISON_CHECK - Full heap intensive check of poison

UMM_INFO_PRINT - This new define makes building UMM_INFO with printing
capability, optional. When umm_info(NULL, true) is used to print a debug view of
heap information to the debug port, it has to walk the heap and print out
information, while in a critical section. This requires that the print function
be able to print w/o doing malloc calls and from an IRQ disabled context. It
also requires more IRAM to handle printing. Without this define
`umm_info(NULL, true)` will not print.
* UMM_INFO_PRINT is enabled as part of selecting `Debug port: "Serial" or
* "Serial1"`. To make available all the time use '-D UMM_INFO_PRINT`.

A cautionary note, on the use of UMM_INTEGRITY_CHECK, UMM_POISON_CHECK, and
UMM_INFO_PRINT. All of these run with IRQs disabled, for periods that can go
into 100's of us. With umm_info(NULL, true) that may go into seconds, depending
on the serial interface speed and the number of memory allocations present. Use
UMM_INTEGRITY_CHECK, UMM_POISON_CHECK, and UMM_INFO_PRINT sparingly.
If you want to see numbers for the disabled time, explore using
UMM_CRITICAL_METRICS in umm_malloc_cfg.h.

Author: mhightower83

cores/esp8266/umm_malloc/umm_malloc.cpp

@@ -130,45 +130,6 @@
   * In one form or another these features have been restored in the
   * reintegration of the upstream umm_malloc into the Arduino ESP8266 Core.
   */
-/* This block will be used for the non-WIP PR description:
-
-This updates the heap management library, umm_malloc, to the current upstream
-version at https://github.com/rhempel/umm_malloc. Some reorganizing and new code
-was needed to use the new version.
-
-This is a list of note worthy changes:
-
-UMM_POISON - now has a lite option as well as the previous intensive check
-option. The code for running the full poison test at the call of the various
-alloc functions was removed in the upstream version. In this port the missing
-code was added to heap.cpp and umm_local.cpp.
-* UMM_POISON - appears to have been partially changed to UMM_POISON_CHECK,
-  I treat it as depricated and used UMM_POISON_CHECK, when needed. 
-  However, the Arduino Core's references to UMM_POISON were replaced with 
-  UMM_POISON_CHECK_LITE.
-* UMM_POISON_CHECK_LITE - Less intense, it just checks poison on active
-  neighboring allocations.
-* UMM_POISON_CHECK - Full heap intensive check of poison
-
-UMM_INFO_PRINT - This new define makes building UMM_INFO with printing
-capability, optional. When umm_info(NULL, true) is used to print a debug view of
-heap information to the debug port, it has to walk the heap and print out
-information, while in a critical section. This requires that the print function
-be able to print w/o doing malloc calls and from an IRQ disabled context. It
-also requires more IRAM to handle printing. Without this define
-`umm_info(NULL, true)` will not print.
-* UMM_INFO_PRINT is enabled as part of selecting `Debug port: "Serial" or
-* "Serial1"`. To make available all the time use '-D UMM_INFO_PRINT`.
-
-A cautionary note, on the use of UMM_INTEGRITY_CHECK, UMM_POISON_CHECK, and
-UMM_INFO_PRINT. All of these run with IRQs disabled, for periods that can go
-into 100's of us. With umm_info(NULL, true) that may go into seconds, depending
-on the serial interface speed and the number of memory allocations present. Use
-UMM_INTEGRITY_CHECK, UMM_POISON_CHECK, and UMM_INFO_PRINT sparingly.
-If you want to see numbers for the disabled time, explore using 
-UMM_CRITICAL_METRICS in umm_malloc_cfg.h.
-
- */
 
 /*
  * Added for using with Arduino ESP8266 and handling renameing to umm_malloc.cpp