Added call to System.gc() to release Windows' lock on library files

app/src/processing/app/Library.java

@@ -196,6 +196,10 @@ public class Library {
 
     // get the path for all .jar files in this code folder
     packageList = Base.packageListFromClassPath(getClassPath());
+    
+    // Garbage collect any objects that have a lock on the files and prevent
+    // windows from manipulating this library's files.
+    System.gc();
   }