Add Republic of Korea BandPlan

[bsy0318]

Add Republic of Korea BandPlan. It's not the Democratic People's Republic of Korea!

[AlexandreRouma]

SDR++ doesn't support displaying characters outside the latin alphabet so the bandplan won't display properly. This needs to be translated to english. Also there are some typos in the band types (eg. marin instead of marine)

[bsy0318]

Hello! I've made the requested changes and submitted a pull request. Please review it. :)

[AlexandreRouma]

Alright, just one last thing. The indentation has to be 4 spaces like it was before.

[bsy0318]

Thank you for your quick response! I've made the requested changes and submitted a pull request. Please review it. :)

[AlexandreRouma]

I'm finding more errors, some amateur bands have type "fixed" instead of "amateur"

[bsy0318]

corrected that

[bsy0318]

In addition, this is designated by the Korea Radio Administration Authority.