Rename ezcod_3 to ezcod
o Begin support for up to 12 symbols; 60 bits of lat/lon precision
o Add ft. and Latitude labelling to error calculation
Formalise space seperators, Location/Parity marker
o Support optional '.' or '!' seperator between Location/Parity symbols
o Support any of the horizontal/diagonal slashes as erasure markers
o Correctly support 1-12 Location symbols, any number of Parity symbols
Further cleanups
o Complete renaming ezcod_3*.js to ezcod*.js, start of cheerp support
o Provide a cheerp-compatible simple C++ object encapsulating C API
Merge branch 'feature-polish'