Make inserting a large number of tags easier

[moritz157]

I wanted to annnotate traffic signs in a dataset and therefore had over 50 different classes. These were already existing in a file, one class in each line. When I tried to copy and paste them into vott it did not split them at each line-break, but instead it inserted all the lines as one big tag. Therefore I had to copy and paste each line one by one. While this didn't took too long but it still was kind of painfull and also increased the chance to create small errors.

A very simple enhancement would be to automatically split strings pasted into the tag input by line-breaks, commas or semicolons. This would allow to seemlessly insert a larger number of tags that already exist somewhere.

A possible alternative would be to add a feature allowing to import .txt or .csv files containing class names.