feat: Apply password validation (#1896)

src/define.sh

@@ -1444,7 +1444,7 @@ validateLegacyUsername() {
   return 0
 }
 
-validateLegacyPassword() {
+validatePassword() {
 
   local value="$1"
   local desc="${2:-}"

src/install.sh

@@ -1035,6 +1035,7 @@ updateXML() {
   validateResolution "WIDTH" "$WIDTH" 320 || return 1
   validateResolution "HEIGHT" "$HEIGHT" 200 || return 1
   validateProductKey "$KEY" || return 1
+  validatePassword "$PASSWORD" || return 1
 
   app=$(escapeXMLSed "$APP for $ENGINE") || return 1