Eclipse: Process Windows paths correctly using cygpath

Includes splitting the Windows Eclipse setup doc into a separate page,
as it has so many additional steps.

Addresses github #17 and #166
https://github.com/espressif/esp-idf/issues/17
https://github.com/espressif/esp-idf/issues/166

tools/windows/eclipse_make.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+#
+# Wrapper to run make and preprocess any paths in the output from MSYS/Cygwin paths
+# to Windows paths, for Eclipse
+from __future__ import print_function, division
+import sys, subprocess, os.path, re
+
+UNIX_PATH_RE = re.compile(r'(/[^ \'"]+)+')
+
+paths = {}
+def check_path(path):
+    try:
+        return paths[path]
+    except KeyError:
+        pass
+    paths[path] = path  # cache as failed, replace with success if it works
+    try:
+        winpath = subprocess.check_output(["cygpath", "-w", path]).strip()
+    except subprocess.CalledProcessError:
+        return path  # something went wrong running cygpath, assume this is not a path!
+    if not os.path.exists(winpath):
+        return path  # not actually a valid path
+    winpath = winpath.replace("\\", "/")  # make consistent with forward-slashes used elsewhere
+    paths[path] = winpath
+    return winpath
+
+def main():
+    print("Running make in '%s'" % check_path(os.getcwd()))
+    make = subprocess.Popen(["make"] + sys.argv[1:] + ["V=1"], stdout=subprocess.PIPE)
+    for line in iter(make.stdout.readline, ''):
+         line = re.sub(UNIX_PATH_RE, lambda m: check_path(m.group(0)), line)
+         print(line.rstrip())
+    sys.exit(make.wait())
+
+if __name__ == "__main__":
+    main()