Mbed-flasher

128 Refactor Mbed erase
131 Reject file to be flashed based on file extension

90 windows: use quotes around copy operation parameters
93 Find error from FAIL.txt instead of exact match
89 consolidate exit codes
91 add github templates
88 allow to erase other than K64F devices
86 Allow some time for serial point to appear

81 Fix stage block green when failure occurs

This patch release tune flash failures for Nucleo board slightly better and handle dependencies better.

Known issue
PyOCD flashing method has been broken for a while 160.
This will be fixed in coming release.

Fixes
155 Nucleo specific FAIL.TXT handling
158 Pin python dependencies to an API version, remove pyocd dependency


v0.10.0-mbedls_v162
Static mbed-ls1.6.2