Rewrite Windows KeyboardEmulation, improve DevReadme

This commit is for the Windows distribution. It:

- Replaces the use of SendKeys with the lower-level `win32api.keybd_event`
	+ Now keys are emulated down and up like on Linux and OSX
	+ Works on more applications, like:
		* Z-Type
		* 10FastFingers
		* GTK+ Programs (Pidgin)
		* ...virtually all programs
	+ Support for more keys
		* Window key support (Super_L/R)
		* Media keys
			- Vol_Up
			- Vol_Down
			- Vol_Mute
			- Media_Play_Pause
			- Media_Next
			- Media_Prev
			- Media_Stop
			- Sleep
		* F1 through F24
		* Caps_Lock (affects output)
		* Help, Num_Lock, etc.
- Update Windows DevReadme to address complications when setting up.
  Remove ambiguity.