updated arduino-cmake from github

also modified DETECT_VERSION_PATCH range high from 3 to 5
JohnRB's changes for spektrum/sbus serial and rx3m support!
Merge pull request #1 from John-RB/JohnRB

John rb
Fix S.BUS Frame Rate and Stick Cal, add RX3SM Device Type
FIx S.BUS Frame Rate and Stick Cal, add RX3SM Device Type
Merge pull request #2 from John-RB/JohnRB

John rb
Added support for EagleA3Pro stabiliser board
Added support for EagleA3Pro stabiliser board
Added support for Arduino v5
New build archive with support for EagleA3Pro
Added support for EagleA3Pro stabiliser board
Documentation supplement for EagleA3Pro support
Minor post-merge edits.

- bump up config_ver to 5
- rebuild hex files, which changed due to the config_ver bump.
- created Docs directory
- move 8mhz builds into "test"