all: Prune trailing whitespace.

Prune trailing whitespace across the whole project (almost), done
automatically with:

    grep -IUrl --color "[[:blank:]]$" --exclude-dir=.git --exclude=*.exp |\
        xargs sed -i 's/[[:space:]]*$//'

Exceptions:
- Skip third-party code in lib/ and drivers/cc3100/
- Skip generated code in bluetooth_init_cc2564C_1.5.c
- Preserve command output whitespace in docs, eg:
  docs/esp8266/tutorial/repl.rst

Signed-off-by: Phil Howard <phil@gadgetoid.com>

ports/rp2/CMakeLists.txt

@@ -41,7 +41,7 @@ endif()
 set(MICROPY_USER_FROZEN_MANIFEST ${MICROPY_FROZEN_MANIFEST})
 
 # Include board config, it may override MICROPY_FROZEN_MANIFEST
-include(${MICROPY_BOARD_DIR}/mpconfigboard.cmake) 
+include(${MICROPY_BOARD_DIR}/mpconfigboard.cmake)
 
 # Set the PICO_BOARD if it's not already set (allow a board to override it).
 if(NOT PICO_BOARD)