Fix new folder and file creation spamming issues

Fixes #108

Place more aggressive checks to clear selection if new folder or file was being created and user aborts by clicking outside or any other way
There was another issue on empty structure(no files or folder yet) if i tried to create a new folder, it was impossible, on the input field click it just focused out, this might had been some edge case happening for me only but i fixed it as well

PS: Its not the best fix possible, I patched this in a hurry for our internal use, but thought should contribute back in whatever state it is. Seems to work fine for us for now. I will keep posted if we discover any other issue.

uptick / react-keyed-file-browser

Fix new folder and file creation spamming issues #114