DataHandle#readLine() use StringBuilder instead of StringBuffer

- StringBuilder is faster and recommended for most cases

Author: gab1one

src/main/java/org/scijava/io/handle/DataHandle.java

@@ -563,7 +563,7 @@ default double readDouble() throws IOException {
 	default String readLine() throws IOException {
 		// NB: Adapted from java.io.RandomAccessFile.readLine().
 
-		final StringBuffer input = new StringBuffer();
+		final StringBuilder input = new StringBuilder();
 		int c = -1;
 		boolean eol = false;