It did not read the input string due an error in 
utfcodec:_utf_sentinal_iterator and did not include the null terminator 
in calculated size from context_to_utf16.

Also fix up a number of types in fucntion names and the KM_API macros to 
mark functions as exportable.

The type was called km_knp_option_set but the functions we called 
km_kbp_options_set_*

Export of action items still todo.

These will be needed by the state_to_json API call.

Also pull trivial adaptors for keyboard an context into the internal 
data structres header files.

Move classes to separate compilation units so the can be used in the 
state object

This is a temporary set of build scripts for the keyboard processor 
work, until a cross platform build system is settled on for the whole 
keyman project.

Move VKEY action types to end of enumeration as these will go away
Kill the km_kb_state_flag as these are un-needed.
Add the dump state json function for debug and ide.
Turn engine attrs into a struct instead of an array.

And a couple of minior tidy ups for the union data structures and fixes 
to bring implementation and docs into alignment.

Add json export function

Also minor constness fixes.

Header's and start of null keyboard processor for testing.

[linux] Linux kmp installer