Improvements on Tsakonian keyboard

[jgchaparro]

Following Kostakis' orthography for the Tsakonian language, the characters used for Tsakonian sounds th, ph and kh use an accent mark instead of a dot. These should be modified to τ̇, π̇ and κ̇ and their capital counterparts. Additionally, the mark τ͡σ is absent from the keyboard.

Could these be added? Happy to provide further details on the matter.

[LornaSIL]

Tsakonian