Added tab close functionality that allows you to close a tab using a small x in the top right corner of closable tabs.
Merge branch 'dev' of https://github.com/cs3733bdt/wpi-suite into dev

# By Jeffrey Signore
# Via Jeffrey Signore
* 'dev' of https://github.com/cs3733bdt/wpi-suite:
  Added some GUI features to the active games screen. Jeffrey Signore, Jonathan Leitschuh.