Fixes #1241. Added SendKeys feature to the ConsoleDriver. (#1242)

* Fixes #1234. Setting Handled to true in the KeyPress event avoids ProcessKey from running.

* Using literals values in Assert.Equal.

* Can't use numbers variables on the left side of an Assert.Equal/NotEqual, it must be literal (Linux only).

* Fixes #1241. Added SendKeys feature to the ConsoleDriver.

* Fixes SendKeys unit test.

* Changed Key.Null to '\0' (null string).

* Fixes the space bar when there are another previous char.

* Now the drivers are reading up to 255 from ASCII table.

* Fixes CursesDriver and WindowsDriver SendKeys.

* Fixes NetDriver SendKeys.

* Fixed unit test.