Manual Update

While this draft of the manual is still incomplete, it is much more accurate than the current official version. See http://starstrider42.github.io/RemoteTech/ for a copy of the draft.

Major changes:

* Section explaining options in `RemoteTech_Settings.cfg`
* More readable tutorials section
* Rewrote omni network tutorial to use a more robust network design
* Include all features currently merged to `develop` or `master`.

Note: due to #180 moving the texture files, the button images in this manual will be broken until 91f7eda is merged to `master`.