Additions and changes to diacritics (Implements #533 and #534)

[conquerist]

Implement two proposed changes.

Note for #533:
Added mapping for all five vowels, the original proposed change only had A and E

Note for #534
Follows the proposed variant 2

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
packages/keybr-keyboard-io/lib/parser/diacritics.ts	0% smaller
packages/keybr-unicode/lib/diacritics.ts	0% smaller

[conquerist]

I accidentally closed this PR by renaming the modified branch, please ignore. My apologies for any unnecessary confusion.