core.param2: add todo reimplement notice

Ref https://discord.com/channels/1135598362821935254/1247681375935533119

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Hi, a wild //orient+ appeared! While it (probably) doesn't crash, it also unfortunately doesn't work yet.

This is because facedir e.g. points towards the direction the node is pointing, and minetest.facedir_to_dir doesn't capture all the nuance of how the node is pointing, and e.g. if a node is pointing +y and you want to rotate by (0, 90, 0) [degrees], then the current implementation won't do anything.

Then I decided that this is silly and there has to be a solution. After all, screwdriver2 has a great implementation! https://content.minetest.net/packages/12Me21/screwdriver2/

....then I found this lookup table in their codebase: https://github.com/12Me21/screwdriver2/blob/master/init.lua#L75-L79

....aaaaarrrggggghhhhh //orient+ is such a pain to implement!

and my existing implementation is so neat 😢 https://github.com/sbrl/Minetest-WorldEditAdditions/blob/1dd073f14bcac8e26a5ced2abe54c709099b1de2/worldeditadditions_core/utils/param2.lua

so, in other words, although I've implemented //orient+ I'm going to have to reimplement the nuts-and-bolts function that does the rotation, which may make it slightly more complicated and annoying to implement support for nodes with param2 types other than facedir.

/rant about Minetest's param2 value and rotations 😛

worldeditadditions_core/utils/param2.lua

@@ -3,6 +3,8 @@ local Vector3 = core.Vector3
 ---
 -- @module worldeditadditions_core.param2
 
+-- TODO Reimplement for facedir ref https://github.com/12Me21/screwdriver2/blob/master/init.lua#L75-L79
+
 -- //set <nodename>
 -- //set param2|p2 <param2>
 
@@ -25,6 +27,7 @@ local function dir_to_param2(param2_type, dir)
 end
 
 
+
 --- Rotates the given param2 value of the given type by the given COMPILED list of rotations.
 -- In other words, reorients a given param2 value of a given param2_type (aka paramtype2 in the Minetest engine but the Minetest engine naming scheme is dumb in this case) according to a given COMPILED rotation list. 
 -- @param	param2		number		The param2 value to rotate.