Add more verbose errors & multiple error emails

[paraswtf]

1. The error email should contain the cell that might have caused the error.

For example:	Employee Email	Error	Cell
roshan@rivant.in	taskData[j][assignedOnIndex].toLocaleDateString is not a function	H2
tanisha@rivant.in	taskData[j][assignedOnIndex].toLocaleDateString is not a function	H3
altamash@rivant.in	taskData[j][assignedOnIndex].toLocaleDateString is not a function	H5
deepanshu@rivant.in	taskData[j][assignedOnIndex].toLocaleDateString is not a function	H7

The cell column is a clickable link. Instead of

2. Multiple error notification emails

For, e.g. Project Manager & IT are notified about tasks not being sent. The project manager can try to fix the format; IT can fix any bugs.

3. The table in the mail isn't properly formatted. It is difficult to read.

This can be fixed by adding borders and left alignment along with some background colour for the heading. Refer to below format.

References

For clickable links to cell

[paraswtf]

resolved in #17