[GUI/Backend] Create Pause Button and Functionality

[dmz38]

Users should be able to hit a pause button on the GUI, which will put the drones into a "hover" pattern at the next place where there is zero velocity.

• A pause button should be shown in the GUI, just like | |
• The server should have the implementation of the functionality so when the button is pressed the server will act upon the request from the client.

[dmz38]

Should go to next point, then hover. Server side idle check may be needed.

[tessmichi]

@dmz38 Is the gui element done - as in, all that's left is the backend?

[dmz38]

Pause button action added, but no functionality built on the server side quite yet.

[zls29]

Functionality added as a part of #94

[tessmichi]

Waiting to close, need @dmz38 to verify that GUI is able to connect to backend described by Zach

[tessmichi]

Discussed with Dan. Dan will verify the front end tonight and get all of that finished tonight, including fetching master and merging it into the commandCenter branch. Zach will spend time within the next couple of days debugging a segfault on the server side. Zach will be the one making the PR when everything is ready.

[dmz38]

This part is done gui wise and just needs to be tested once all other functionality is complete to close.