Speech Dispatcher: Implement IsSpeaking().

SRAL_Delay: Correctly cancel the speech queue events when calling SRAL_StopSpeech*.

Speech Dispatcher: Check for interrupt if spelling enabled.

Speech Dispatcher: Some fixes.

Speech Dispatcher: Add SSML support.

Fix return in SRAL_UnregisterKeyboardHooks.

SRAL_Initialize: Don't return true, if there are no engines initialized.

SAPI: Use SpeakToMemory in Speak to avoid repeating code parts.

Add .gitattributes for bypass any CRLF.

Fix Windows builds with CLang compiler

QueuedOutput: Use std::string for text, instead of const char*.

Some improvements in SRAL.cpp. *Make delayed outputs more thread-safe, with mutex locks.

Fix SRAL_GetEngineName.

Update Python Bindings. (#21)

Include stdbool.

Restore stdlib inclusion.

Add SRAL_malloc/free functions.