Add mesh align options

I don’t think putting align options in dropdown menu was a good idea.

For example if you constructing blockout of a large scene with many objects, you adding new meshes constantly, and minimizing clicks is more beneficial for the user than compact UI.

2.7 had checkbox and it was ok

but all options as buttons would be even better

Tip: you can scroll values in dropdown menus (an most other ui elements) by hovering over and using Ctrl + Mouse Wheel. So technically now you can do it with less clicks (1 vs 0) than before :wink: