Add trim to ZString.

ZString.cpp

@@ -397,6 +397,11 @@ namespace coreutils {
       return ZString(temp, tempend - temp);
    }
 
+   ZString ZString::trim() {
+      skipWhitespace();
+      return unparsed();
+   }
+
    int ZString::find(ZString comparator) {
       int count = 0;
       char *temp = cursor;

ZString.h

@@ -321,7 +321,13 @@ namespace coreutils {
       ///
       
       ZString goeol();
-      
+
+      ///
+      ///
+      ///
+
+      ZString trim();
+
       ///
       /// Return a block of data as a ZString from the cursor location for
       /// the number of bytes specified by size.

testing/zstring_test.cpp

@@ -91,5 +91,8 @@ int main(int argc, char **argv) {
    std::cout << test16.substring(10, 4) << std::endl;
    std::cout << test16.substring(0, 7) << std::endl;
    std::cout << test16.substring(18, 20) << std::endl;
+
+   coreutils::ZString test17("   hello there   ");
+   std::cout << "[" << test17.trim() << "]" << std::endl;
    
 }