texture editor: presets for common texture sizes

simple feature: 
In the texture editor, while the resize layer and resize canvas are selected, the bottom left corner only says "click on canvas to use", which opens a window where you can select the new size of the layer or canvas. it defaults to the current size of the element, but it would save a lot of clicks, if the bottom left are had some buttons with all the common dimensions, such as 16x16, 32x32, and maybe even custom dimensions, or even armor or banner texture dimensions. i mean, you CAN ctrl v often used numbers in, but it still requires much more clicks than it should.