Phrases API update

1. ORM library Phrase class description

2. C API functions for phrase operations: sol_FindPhrase, sol_AddPhrase, sol_DeletePhrase, sol_GetPhraseText, sol_GetPhraseLanguage, sol_GetPhraseClass.

3. .NET wrapper function sol_GetPhraseTextFX

4. Delphi wrapper function sol_GetPhrasePAS.