filtering files for code check seperately to enable fast use of git pre-commit hook to check code style

ask user to install pre-commit hook when code style is checked

Tools/fix_code_style.sh

@@ -1,14 +1,5 @@
 #!/bin/bash
 
-ASTYLE_VER=`astyle --version`
-ASTYLE_VER_REQUIRED="Artistic Style Version 2.05.1"
-
-if [ "$ASTYLE_VER" != "$ASTYLE_VER_REQUIRED" ]; then
-  echo "Error: you're using ${ASTYLE_VER}, but PX4 requires ${ASTYLE_VER_REQUIRED}"
-  echo "You can get the correct version here: https://github.com/PX4/astyle/releases/tag/2.05.1"
-  exit 1
-fi
-
 if [[ $# -eq 0 ]] ; then
   exit 0
 fi