Update RSyntaxTextArea to 2.6.1

This imports the unmodified upstream version of RSTA from
http://repo1.maven.org/maven2/com/fifesoft/rsyntaxtextarea/2.6.1/rsyntaxtextarea-2.6.1.jar
since the Arduino-specific changes are no longer required.

This fixes #5888

Author: matthijskooijman

app/.classpath

@@ -43,7 +43,7 @@
 	<classpathentry kind="lib" path="lib/slf4j-simple-1.7.22.jar"/>
 	<classpathentry kind="lib" path="lib/jsch-0.1.50.jar"/>
 	<classpathentry kind="lib" path="lib/jssc-2.8.0.jar"/>
-	<classpathentry kind="lib" path="lib/rsyntaxtextarea-2.5.8.1+arduino.jar"/>
+	<classpathentry kind="lib" path="lib/rsyntaxtextarea-2.6.1.jar"/>
 	<classpathentry kind="lib" path="lib/xml-apis-1.3.04.jar"/>
 	<classpathentry kind="lib" path="lib/xml-apis-ext-1.3.04.jar"/>
 	<classpathentry kind="lib" path="lib/xmlgraphics-commons-2.0.jar"/>

app/lib/rsyntaxtextarea-2.5.8.1+arduino.jar

@@ -49,7 +49,7 @@
     <cp>%EXEDIR%/lib/jsch-0.1.50.jar</cp>
     <cp>%EXEDIR%/lib/jssc-2.8.0.jar</cp>
     <cp>%EXEDIR%/lib/pde.jar</cp>
-    <cp>%EXEDIR%/lib/rsyntaxtextarea-2.5.8.1+arduino.jar</cp>
+    <cp>%EXEDIR%/lib/rsyntaxtextarea-2.6.1.jar</cp>
     <cp>%EXEDIR%/lib/xml-apis-1.3.04.jar</cp>
     <cp>%EXEDIR%/lib/xml-apis-ext-1.3.04.jar</cp>
     <cp>%EXEDIR%/lib/xmlgraphics-commons-2.0.jar</cp>

app/lib/rsyntaxtextarea-2.6.1.jar

@@ -49,7 +49,7 @@
     <cp>%EXEDIR%/lib/jsch-0.1.50.jar</cp>
     <cp>%EXEDIR%/lib/jssc-2.8.0.jar</cp>
     <cp>%EXEDIR%/lib/pde.jar</cp>
-    <cp>%EXEDIR%/lib/rsyntaxtextarea-2.5.8.1+arduino.jar</cp>
+    <cp>%EXEDIR%/lib/rsyntaxtextarea-2.6.1.jar</cp>
     <cp>%EXEDIR%/lib/xml-apis-1.3.04.jar</cp>
     <cp>%EXEDIR%/lib/xml-apis-ext-1.3.04.jar</cp>
     <cp>%EXEDIR%/lib/xmlgraphics-commons-2.0.jar</cp>