Imgui: Mega screenshots

[ocornut]

I should be posting this to the Gallery Thread #1269 but the files here are rather big and I don't want to spam the screen.

Today I upgraded my Screenshooting tool to create mega-capture of very big windows by moving the window and stitching multiple capture.

https://github.com/ocornut/imgui/wiki/screenshot_tool

It's mostly for fun right now.
Perhaps I can use something like that to generate shots for the main github page, and either way more automation is always useful (e.g. for #435.). Also interesting because at a glance you can see some of the issues that a theme may have (the "white" theme below has issues).

Results:

[rokups]

Were these styles shared anywhere? They look gorgeous and i would love to get my hands on them.

[ocornut]

I'm working on making those available in the default imgui but ran into some tangential problems (e.g: bordering). You can grab many of them here: https://github.com/ocornut/imgui/issues/707 or click on the Style label here.