Merge pull request #399 from Smoothieware/edge

stable edge before multitool
update firmware.bin fir master
Merge branch 'edge'

Conflicts:
	FirmwareBin/firmware.bin
initial refactor for leveling strategies
add the leveling_strategies from config
finalize zprobe and delta calibration refactor
Merge pull request #468 from wolfmanjm/refactor/zprobe-levelling

Refactor/zprobe levelling
Initial start at a threepoint bed leveling strategy
implement probing, and plane definition and z offset calculation
add loading strategy to zprobe
refactor ctor and dtor into cpp
add example config
added some placeholders for function hook in
only backoff after homing if triggered and asked to move
Merge pull request #469 from wolfmanjm/upstreamedge

only backoff after homing if triggered and asked to move
only backoff after homing if triggered and asked to move
update firmware.bin
Add homing order to config
fix potential homing race condition
add tolerance to probes
revert disable msd change to avoid buggy windoze BSOD
Merge pull request #470 from wolfmanjm/upstreamedge

revert disable msd change to avoid buggy windoze BSOD
make speed volatile so acceleration tick can see it
fix bug in homing type selection