codestyle: specify line-ending, trailing-whitespace and tab rules

# This file provide reference settings for the APM code conventions
# There are plug-ins available for nearly every text editor to automatically
# respect the conventions contained within this file.
#
# Please see editorconfig.org for complete information.
#
# If you find errors in this file, please send a pull-request with a fix.
#
Copter: add V-Tail to FRAME param's @Value
Copter: fixup line endings to be newline
Tools: fixup line endings
Tools Serial Proxy: fixup line endings
AutoTest: fixup line endings
AC_PID: fixup line endings
AP_ADC: fixup line endings
AP_Airspeed: fixup line endings
BattMon: fixup line endings
Compass: fixup line endings
Notify: fixup line endings
OptFlow: fixup line endings
AP_Param: fixup line endings
PID: fixup line endings
Copter: Document stream rate parameter functionality