resize node

[lucasw]

Lots of non-nodelet version in random locations.

Want to both have library that makes it easy for other nodelets to resize images, and have standalone nodelet.

There should be multiple resize modes:

• resize without preserving aspect ratio
• preserve aspect ratio and fit to screen - black bars on top and bottom or sides if different ar (or reflect, wrap?)
• preserve aspect ratio and fill screen - lose the portions on top and bottom or sides if different ar
• 1-1 pixel - plus offset xy, scale factor, border wrap/reflect modes

[lucasw]

This is duplicate in image_proc now? Or that doesn't have all the features here?