Register both luacontroller and microcontroller variations of detector craft recipes.

* Support detection of multiple players in object detector
* Add distance parameter to node detector
* Fix area protection

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.

Settings can now be retrieved by mesecon.setting(<name>, <default>) and can be modified without
editing the source code by adding the setting to minetest.conf
For instance, you can add mesecon.blinky_plant_interval = 0.5 to minetest.conf in order to
increase the blinking speed.
Rewrite the blinky plant with nodetimers.
Fixes #161

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.

wires 2 nodes below them, allows to hide circuitry powered by them.
Fixes #179
Rewrite pressure plates + vertical wires using mesecon.register_node.

Add node detector, which works like the player detector but detects a specific nodename (or any node except air) in front of it.

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.

* Name to scan for can be specified by right-clicking it
* It can receive digiline signals that change the name to scan for
* A sign above it for the name doesn't work anymore (this features wasn't used often anyway)

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)

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.

Upload after major code reorganization - Version 0.6 DEV - Split mesecons mod into several modules - [BUGGY?]