Adds support for special characters in WebDAV password, updates password to use SecureString and masking
Adds support for special characters in WebDAV password, updates password to use SecureString and masking

jmarden/letsencrypt-win-simple,Lone-Coder/letsencrypt-win-simple,brondavies/letsencrypt-win-simple,rkerber/letsencrypt-win-simple