moved mac storage to singleton, tried to reduce response time

See merge request !26

Minor additions to host

See merge request !25

# Conflicts:
#   host/host_central_mast/src/main.cpp

Refactor of Host ESP32

See merge request !24

Move SD card specific utilities into their own namespace
Try remounting SD after a number of failed attempts (see Definitions.h)
Early exit continuous SD access if the SD has not been found before.

# Conflicts:
#	host/host_central_mast/src/main.cpp

Resend Data capabilities

See merge request !22

Develop central mast client

See merge request !21

Create a simple mock client that sends pseudo random values

See merge request !20