A_10

Fluids!
+ Water: extends entity.  slows the player while in contact
+ Added speed and speed_cap modifiers to entity, and a variable storing
whether the given entity is in a fluid
+ Added entity_code variable to entity, to store what type of entity it
is
+ Added more image loaders to entity, one to set a single image to the
entity and another to return an image label, for fluids to texture their
full area as a tile-based system

+ Added more codes to Level
* Fixed layer control in Level, now everything is where it belongs.
separated platforms from other walls so that the player is above them,
but all other walls are above the player and all particles

+Added WALL_JUMPSPEED constant to player, to control his vertical jump
while wall jumping separately from his normal jumps
+ Changed damage calculation so that damage is a negative value while
heals are a positive value