Advanced TIMIT handling

[cyrusae]

Statement of intent per current notes to self:

# TODO: add rest of TIMIT: 
### PAU, EPI, H# lack relevant IPA equivalents
### AX-H, BCL, DCL, GCL, HV, KCL, PCL, TCL are not present here and do, strictly speaking, have IPA equivalents that could be included 
### In practice I'm not sure the additional symbols would parse correctly for R's sake from a Unicode perspective but they *could* be added as options to have simplified to the vanilla IPA version?
##### TODO: Add ability to detect and simplify TIMIT 
##### TODO: Add disclaimer that the above happens 

• Add above symbols to weirds as TIMIT inclusion
• Add IPA equivalents (need to verify Unicode codes)
• Add test data using them
• Add IPA examples (without additional special characters)
• Document dropped variables
• Integrate into project
• Check for collisions (since some of these simplify to existing ARPAbet)
• Possibly try turning the additional TIMIT extensions into ARPAbet first?

[cyrusae]

Update: nope Past Me already integrated some diacritic handling, buckle up boys we're doing this now