v1.3

This version brings the following changes:

• Important: Changed / introduced folder structure. The API is now in an apis folder and the programs (lama-conf) in a programs folder. This breaks the old installer on pastebin, get the new one if you plan on using it, please. You'll also have to either move the files or adjust your os.loadAPI paths. Sorry for the inconvenience.
• Switched to lazy initialization. This means calling os.loadAPI("apis/lama") will no longer block due to the API finishing pending moves. Instead, the first call to any function in the API will trigger initialization and may block. A new function, lama.init() has been added specifically for this, but any function will trigger the same logic before doing its own thing. The intention is to allow other startup programs to run before continuing interruped movement.
• Fixed broken math.huge serialization, which means resuming moves using an infinite number of tries didn't work. This was actually textutils.serialize/unserialize's fault, it writes inf and then reads that back as nil, because it's interpreted as a variable.
• Fixed waypoints being deleted if some other part of the state was invalid.
• Changed how indestructible blocks and invulnerable entities are handled. When one is encountered, the move will now fail immediately. This is because moves with an infinite number of tries would otherwise never return when hitting bedrock, for example.
• Tested some more for robustness using my own [mining program][jam]. It even survived two game crashes, so I feel this can safely be called stable now.