Rename .tools to .mystools for Arduino IDE (#686)

* The Arduino IDE considers the .tools directory
special and warns if it finds .tools the repo

References #672

.tools/cppcheck/run.sh

@@ -1,19 +0,0 @@
-#!/bin/bash
-
-# Instantiate the tool runtime shim
-. "$(git mystoolspath).bundle_runtime.sh"
-
-# cppcheck takes one or more files as an argument.
-# --cached or <no arg> for changed
-if [[ $# = 0 ]]; then
-	for file in $(modifiedSourceFiles); do
-		runBundle $file
-	done
-elif [[ $1 = '--cached' ]]; then
-	for file in $(stagedSourceFiles); do
-		runBundle $file
-	done
-else
-	eval "set -- $(git rev-parse --sq --prefix "$GIT_PREFIX" "$@")"
-	runBundle "$@"
-fi