1. Enhance Source Files selection in msa:

   a. Can select multiple files one time
   b. Totally same file can be added once
2. Separate sort functions from Tools.java to Sort.java
3. Fix a bug of new function: to create directory first if the file's directory doesn't exist
4. Adjust some file's coding style

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1058 6f19259b-4bc3-4df7-8a09-765794883524