Fix jinja relative pathes for windows. Templatepathes in jinja must be '/' separated.
Fix jinja relative pathes for windows. Templatepathes in jinja must be
'/'
separated.

In addition catch the TemplateNotFound error from jinja, which is not
compatible with SCons

dergraaf/xpcc,dergraaf/xpcc,chrism333/xpcc,chrism333/xpcc,dergraaf/xpcc,chrism333/xpcc,chrism333/xpcc,dergraaf/xpcc