Ported binary launcher to Windows. * Reorganized the parpg executable source so that it now compiles with the MSVC compiler (tested with MSVC Express 2010). * Cleaned up the launcher source by adding a bunch of const statements and removing the superfluous NULL_TERMINATE macro. * Fixed a few memory leaks in the launcher source by freeing malloced/calloced pointers; * Added a new SubstfileEscape builder to the SConstruct script used to escape certain sequences when substituting a template file. This is used to escape backslashes ("\") in c strings in the bin/parpg.c.in template for Windows paths. * Fixed the PY_LIB_DIR_DEFAULT for Windows so that it now correctly points to the default Python installation path. * Modified the SConstruct script to support compiling the launcher executable with debugging symbols in Windows with the DEBUG flag.