This commit adds support for the Pashto language (ps) to espeak-ng. The implementation is based on Urdu language files and includes ps_rules, ps_list, ps_emoji, ps_extra files and updated Makefile.am to include Pashto in the dictionary targets and build rules.

fix: add Pashto data file.

refactor: use enhance rules for stress.

fix: add missing configs.

Add Pashto phoneme support and improve voice files

fix: add Pashto phonemes test.

fix: restore original phonemes.

fix: remove renduandant ps_dict from Make.am file.

fix: use correct phonemes with ipa and stress rules.

feat: translate all en_emoji to Pashto.

fix: add Pashto dict entry in Makefile.am

feat: enhance ps_rules with example pairs and words.

This reverts commit 0f55204522.

This breaks using voice files like mb-de5-en. It could also use
named values for the stress rules (e.g. 'first-syllable').

Keyword stressRule in voices.c handles setting langopts->stress_rule.

tr_languages.c still contains the setting for some languages that don't have a language file yet.

Contributes to:
Issue #218, https://github.com/espeak-ng/espeak-ng/issues/218