Add Estonian muxes

Tried to make it as accurate as possible, but hey, it's a start!

It is very likely that some of the entries have incorrect guard-interval (two different locations on same frequency/mux can have different values, but 1/8 seems to be the default around here) and modulation value (MUX1 is QAM16, MUX2/3 are QAM64 and MUX4 could be QPSK and MUX6/7 are unknown). I'll leave that to fellow Estonians.