adds checks for climbing and prev_state
Adds saving the visited levels

This adds the player.visitedLevels variable to the saving/loading
process
winterwonderland and frozencave fixes
fixed platforms in village-treeline
 Changes to be committed:add files
fixed platforms in village-treeline
prevents attacking while climbing
fixed treeline
fixed acorns walking behind rocks
fixed treeline level
fixed winterwonderland platforms and frozencave
Make sure that info nodes can be opened more than once

Fix #1485
Merge pull request #1529 from hawkthorne/fix_info_nodes

Make sure that info nodes can be opened more than once
Merge pull request #1514 from CalebJohn/states

Fix climbing bug
Merge pull request #1528 from prene7/treeline-prene7

fixes village-treeline
Merge pull request #1526 from prene7/winterwonderland

winterwonderland and frozencave fixes
add greendale baby costumes
Merge pull request #1517 from Protuhj/save_progress

Adds saving the player's visited levels
fixes door & platforms for winter wonderland
fix door & platforms for frozen cave levels