Update Presence Footsteps to Minecraft 1.7.10.

It looks like you are quite busy at the moment, that's why I thought I would update the mod to 1.7.10 for you. There weren't a lot of changes and only some fields / methods had to be changed for the update.

If you have already updated the plugin locally and just not pushed it to GitHub feel free to close this pull request. :)

Here is a compiled version if you want to test it first: [Download](https://github.com/Minecrell/Presence-Footsteps/releases/download/r5-inofficial/PresenceFootsteps_r5_mc1.7.10.litemod)