Typing is not keyboard layout-agnostic

[tristanlabelle]

WebDriver only has a means to send key events, not character events. I use an exotic keyboard layout and the typed text becomes all garbled because of this.

Upstream issues:

• SendKeys not always send correct keys (if keyboard differs (Swedish, English)) microsoft/WinAppDriver#507
• SendKeys sends "ß" instead of "-" appium/dotnet-client#380
• sendKeys applies QWERTY-Style on German Keyboard Setting microsoft/WinAppDriver#446

Possible workaround:

Send alt+unicode decimal code point sequences for each character to be typed. That should be keyboard layout agnostic.

[tristanlabelle]

Addressed by #85, which changed the API shape to make it harder to do the wrong thing (sending text as the keys request value) and provided one way to do the right thing (using alt escape codes to get the correct characters).

[tristanlabelle]

Unfortunately the workaround isn't good enough. See follow-up bug: #108