Capture multiple cameras at once.

Import this single module without dependencies, and run the following.

import multicapture
multicapture.capture()

1. You must have four visible viewports prior to running this command.
2. Captured viewports are put into a GridLayout at their original sizes; try and keep them similar prior to capturing.
3. On Linux, overlapping windows are captured alongside viewport

1. Support arbitrary amount of cameras
2. Provide GUI to arrange/re-arrange layout of up to 4 views, arranged as 2x2, 1x2 or 2x1, both vertically and horizontally.
3. Pre-conditions are fixed; handle imperfect conditions better.

2x2              1x2h           1x2v      
 ___________     ___________    ___________
|     |     |   |           |  |     |     |
|_____|_____|   |___________|  |     |_____|  
|     |     |   |     |     |  |     |     |
|_____|_____|   |_____|_____|  |_____|_____|