created new layer and script for handling dropthrough platform
implemented basic dropthrough platform functionality
added DropThrough script to prefab
made upper right platform into dropthrough platform
made dropthrough platform one tile thick
changed dropthrough algorithm to make the tiles into triggers instead of the player
fixed dropthrough issue when there is adjacent non-dropthrough tile
added a dropthrough platform with two nondropthrough walls for testing
changed dropthrough detection algorithm to no longer use dropthrough duration and instead use Physics2D.IgnoreCollision
fixed drop through to not use checkGrounded to stop dropthrough state
removed unneeded variable and added some comments
added an additional dropThrough platform right under the '4'. camelcased dropThrough layer name and added a new layer for riseThrough
removed airborne field and refactored CheckGrounded methods to be less insane
got RiseThrough platforms working
got rise through platforms working for real
refactored and added some test platforms risethrough
fixed error where player is occasionally able to laterally glide through a one way platform
added comments
removed unneeded comment
combined dropthrough and risethrough tile into one