[bu_phonetic] Update preparing for more vigorous validation

[LornaSIL]

Addresses one keyboard in #4146

I'm still not sure if I would remove the whole ANSI section.
And, if these rules should be modified or removed:

c 
c Pass certain key combinations through unchanged to the application.
c These key combinations have special meanings to applications like Word, and so the application
c needs to see the key combination itself, not the character that it is normally translated to by Keyman.
+ [SHIFT K_ENTER]   > [SHIFT K_ENTER]       c instead of normal translation to U+000A LF
+ [CTRL K_BKSP]     > [CTRL K_BKSP]         c instead of normal translation to U+007F DEL
c NOTE TO ALBERT: This is needed on both my internal and external keyboard, so it has nothing to do with the 
c programming of the external keyboard or its connection to the computer.

[mcdurdin]

I'm still not sure if I would remove the whole ANSI section.

Yes, I think we should remove the entire ANSI section -- it's no longer used by any systems.

And, if these rules should be modified or removed:

c 
c Pass certain key combinations through unchanged to the application.
c These key combinations have special meanings to applications like Word, and so the application
c needs to see the key combination itself, not the character that it is normally translated to by Keyman.
+ [SHIFT K_ENTER]   > [SHIFT K_ENTER]       c instead of normal translation to U+000A LF
+ [CTRL K_BKSP]     > [CTRL K_BKSP]         c instead of normal translation to U+007F DEL
c NOTE TO ALBERT: This is needed on both my internal and external keyboard, so it has nothing to do with the 
c programming of the external keyboard or its connection to the computer.

I think those lines should be removed. They don't work as provided (and without the rules, the keys will be passed unchanged to the app anyway). Keyman does not emit LF or DEL with those keys. Also see lines 2525-2526 which have the same rules.

[LornaSIL]

@mcdurdin ready for review