Tuning now works! :)

Progress:
1. Implement signal status checking.
2. Fix hex string format bug in the mux and FDC service, using %x (C++!!!) instead of {0:x} (C#!!!).
3. Move the service wrappers to their own sub-namespace.
4. Start to implement PSIP/SI table parsers - L-VCT, S-VCT, MGT, NIT, NTT - for scanning.