added a little TODO list

tbc

diff --git a/TODO b/TODO
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+block placement/removal timers
+
+       currently block placement and removal is instantaneous. it should
+       actually take some time to place and remove a block. with
+       removal timing depending on the tool used to remove the block
+
+composite entity animations
+
+       complex entities are made up of part which have their own local
+       transform that can be animated (like e.g. an arm or head)
+
+textures
+
+       do I need to say anything? :)
+
+command line
+
+       usefull for development and later on world administration
+
+font rendering
+
+       mostly for labelled blocks and some ui elements
+
+networking
+
+       exchange of chunks and entities
+
+persistence
+
+       unloaded chunks should be saved to disk and restored when they
+       are loaded again
+
+launcher ui
+
+       select or create a world with configurable parameters
+
+entity ai
+
+       pathfinding, chase and roam states
+
+(block) lighting
+
+       lighting via light emitting blocks and brightness from the
+       manhattan distance to a light source. light levels should be
+       cached with each block and only recalculated on update
+
+gravity
+
+       maybe like light levels? should also store a direction with it in
+       that case. also, global gravity may be a world option.
+
+block attributes
+
+       when blocks are not just a solid rock of color, attributes may
+       become interesting. like labels on signs and contents of
+       containers
+
+chunk traversal
+
+       going from one chunk to the neighboring is highly wasteful as of
+       now. each chunk should have links to its neighbours. also, maybe
+       the chunk loader should keep an index of interesting, if not all
+       chunks by position, possibly base-relative
+
+transparency (blocks and entities)
+
+       transparent blocks because awesome
+
+world generator that is not boring
+
+       maybe divide into biomes and add special features like
+       settlements, ruins, all kinds of interesting stuff