Doesn't use NVDA for text output

[nightblade9]

As discussed with @ndarilek on Discord.

Repro steps:

• Boot up Windows
• Install and launch NVDA
• Under settings, change the voice to a female one
• Run a godot-tts project and execute the code TTS.speak("hello world")
• Press Insert+S until NVDA speech is off

Expected outcome: a female voice reads the text, via NVDA
Actual outcome: a male voice reads the text.

---

I'm pretty sure the speech synthesizer is being used instead of NVDA. There are a couple of other related issues I found:

• Having tool on TTS.gd makes the Godot 3.5.1 editor pretty much unstable and unusable
• The properties for can_detect_screen_reader and has_screen_reader are both false even when NVDA is running

[nightblade9]

Resolved this issue by copying the two DLLs necessary, SAAPI64.dll and nvdaControllerClient64.dll, into the project root folder, and making sure NVDA speech mode was on. Still need to figure out how to detect if NVDA is running, though.