Provide a way to elevate a quick support session to admin

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**Is your feature request related to a problem? Please describe.**
I love the idea of Remotely, it's (almost) perfect for me. I'm the main IT person at my job. There are times when a user needs me to make a change to their computer that requires admin level permissions. In other software, I am able to just go to a menu item, click a button and a credentials box pops up. All the user has to do is click yes. If something like this were implemented, I'd completely switch over to Remotely!

**Describe the solution you'd like**
Have a button in the remote control panel where we can elevate the session using admin info we already know (AD/local account) and have those passed through to the system and the Windows UAC password box is changed to yes/no.

**Describe alternatives you've considered**
TeamViewer and Connectwise Control both have this feature. For TeamViewer, there's also a password that the remote controler must enter. But below that, there's a drop down box where the remote controller to enter credentials of the computer. With ConnectWise Control, the UAC screen is not blocked and you're able to type in the necessary credentials that only the admin should know.

Start by locating the remote control panel and the existing Windows UAC/session permission handling. Define a safe flow for supplying known AD or local admin credentials, preserving appropriate credential secrecy, and allowing the user to approve the elevation; done means the session can elevate to perform administrative changes without blocking the UAC interaction.

Written by the indexing model from the issue text.