IDE Serial Monitor button direct way to pick USB port

[defragster]

<IDE FEATURE>: would be cool if the Serial Monitor button offered right click, or other drop down, to directly pick available devices.

https://forum.pjrc.com/threads/28925-Teensyduino-1-24-Beta-2-Available?p=75689&viewfull=1#post75689

I might do the serial monitor port list at some point. This change for 1.6.5 puts all my serial monitor stuff into its own file, derived from 1.6.x's "AbstractMonitor" class. The main motivation was to separate my many hacks from code they're actively changing, to (hopefully) lessen merge conflicts in the future. But it should also make more substantial edits like that easier.

Please post this on the suggestions forum as a new thread. Otherwise, it'll just be forgotten.