ExcelHandler

Excel handler + jars and everything
Clean up
trying to open project...
removing unnecessary files
everything works again (magically)
Some more cleaning and bugfixes
bug fixes in categroy + todo
readFromExcel->Read
Revert "readFromExcel->Read"

This reverts commit 7e25cb7a28aef16e5dd80bb88ecb9a6bba5790a3.
Merge remote-tracking branch 'origin/ExcelHandler'