Major change: Documentation is now included with mesecons, the website just extracts the documentation in a more readable format

This makes development of new features easier, as documentation can automatically be updated on the website without modifying the website's code!
Every mod that has nodes in the mesecons modpack has a "doc" folder that contains subfolders with recipe, description and preview of the block. The website will discover which documentation is available
by reading the documentation.json file.

flexibility and because it was never inteded to be OOP in the first
place.

mesecon.receptor_on and mesecon.receptor_off are provided by wrappers
(mesecon:receptor_on/off) for compatibility, but will be removed. Mod
programmers that use mesecons: Please update!

Also, fix microcontroller polluting the global namespace and remove some
deprecated stuff.

when powering off the delayer faster than the delay time.
Actually, delayers should have never worked since the ActionQueue update as
they always used the default rules for their output, which is obviously nonsense.

First draft of some kind of Action Queue (just like the globalstep queue in to_update), but more flexible and also including delay functionality (mesecon_delayer).
The queue is also saved to a file, so that when restarting mesecons, delayers resume to the state they had when the game shut down. Needs testing.

here and there to facilitate this.

Digging and footstep sounds for everything that needs them! Plus, pushing buttons, punching switches, and flipping levers all make sounds.

Port a lot more (basically everything apart from gates, pistons and extrawire crossing) to the new nodedef system. There are some problems with wall button and wall lever (in the way they visually connect to wires)

New effector system, effectors have to be registered with mesecon:register_effector(onstate, offstate, rules, function get_rules) rules and function get_rules are optional. You don't have to specify both onstate and offstate (required for e.g. removestone)

fixed deprecated/invalid recipes in lightstones.

fixed copy&paste error in one of the delayer textures

fixed recipe for player detector to rely on microcontroller instead of old IC

visibly connect to neighboring wires.

larger size to properly fit in with the new nodebox-based delayers, and added a
"sides" texture to go with them.  Fixed deprecated tile_images lines.