More control keys

A bit of everything in this update, but what's most important is the changes to the controls :

-dash with the L key. You no longer dash with the same key as pick up/drop.

-added J as alternate jumping key and K as alternate pick up/drop key.

-J, K, L will also work for selecting a level, unpausing and going to the next level on the end of level menu.

-added a tiny cooldown to the dash.

-reimplemented cleared level icons on the level map.

-implemented new look for one of the canonsquids to differentiate it.

-fixed a bug where picking up the chest while overlapping a moving platform and moving sideways would cause the player to not be registered on the floor. 

-fixed real time cycles resetting in Arrow reef.

-fixed level design issue in The cage.

-bosses drop pearls on death, and more the first time you defeat them.

-the first boss is easier and more progressive now.

-updated the texts and cutscenes on the Controls menu.