Let It Snow

- rwhiteout
Added option to toggle which frames are valid collision targets, can get it to be a little more realistic even if you have action bars stacked on each other
Added an extras option to change how long it takes flakes to fade out
Added a minimum delay between each snowflake of flake * 0.20 for heavy or flake * 0.05 for light to break them up and stop clumps of them appearing at the same time
Removed drift options as the snowflakes won't drift anymore beyond the change in X coords

- rblizzard
Added Macaroon and LunarSphere to the collision list

- vsnowy-er
Added basic collision of snowflakes with the UI, this isn't true collision because I'm limited in time/other projects, but it should do a decent job of colliding with all general UI objects, unit frames or action bars.