Added gtimer module plus toa support for native and cc110x_ng
Added gtsp clock sync protocol inclusive example app and tx timestamping for cc110x_ng
Added ftsp clock sync protocol and tx timestamping for cc110x_ng
Added pulsesync clock sync protocol and tx timestamping for cc110x_ng
Refactor of gtsp/ftsp/pulsesync and sanity checks for ftsp/pulsesync