Changed a few key logs to use printf-style instead of string
concatenation to avoid dynamic memory allocation. Still need to move
all remaining logging over to printf-style.
Added option (-DRNS_USE_ALLOCATOR=1) to override new/delete operators for
both allocation metrics and the ability to implement an alternate memory
allocator.
Added option (-DRNS_USE_TLSF=1) to use the alternate TLSF allocator
(must also define RNS_USE_ALLOCATOR). This allocator is well known for
reducing fragmentation and providing constant, O(1)-time allocation
and deallocation for real-time embedded systems.
This TLSF allocator appears to already be the default allocator for
ESP32 boards, but the allocator used by NRF52 is unknown at this time so
the TLSF allocator internal to microReticulum is only being used for
NRF52 boards at this time.
Future memory management improvements will include custom allocators for
long-lived structures like the path table that will segregate them from
the general pool of memory that is constantly cycling, thereby further
reducing fragmentation. It will also allow these structures to use
alternate memory like PSRAM present on T-Beam boards.
Moved LoRa and UDP test code into `examples` folder.
Moved `main.cpp` test app to `examples` folder.
Removed platform-specific filesystem code and replaced with an interface
to be implemeneted by the consumer.
