mineclonia git switched to mcl_redstone instead of mesecons, breaking crafting recipe for chainsaw

[programmerjake]

since there isn't a mesecons_buttons mod in mineclonia git anymore and there are aliases, the code should check for an item existing rather than the named mod existing.

https://github.com/mt-mods/technic/blob/32f1d5a9e76a17b075259b0824db29730c9beb06/technic/tools/chainsaw.lua#L199-L200

[S-S-X]

Feel free to open pull request for this change if you like, also for #386