Keyboard input inconsistencies

While implementing WebDriver keyboard input I found a handful of inconsistencies in the specification:

• https://w3c.github.io/webdriver/#dfn-normalised-key-value
  • The codepoint \uE006, currently mapped to Return should instead be mapped to Enter. The former is not mentioned (anymore) by the relevant UI Events spec.
• https://w3c.github.io/webdriver/#dfn-code
  • The keys < and > each appear twice in the table. As the codes should represent a US keyboard the line "<"; ">"; "IntlBackslash" should be removed.
  • OSLeft and OSRight are called MetaLeft and MetaRight in the UI Events spec.
  • The key \uE00E should map to the PageUp code. (\uE01F shouldn't)
  • The key \uE00F should map to the PageDown code. (\uE01E shouldn't)
  • NumpadAdd is \uE025 not \uE024
  • NumpadSubtract is \uE027 not \uuE026
• https://w3c.github.io/webdriver/#element-send-keys
  • "dispatch actions for a string" 4. Otherwise 2. requires "Dispatch a composition event with arguments "compositionstart" and undefined." but the UI Events spec mandates that the data attribute must be the empty string.

Start by comparing the referenced WebDriver sections for normalised key value, code, and element send keys with the linked UI Events requirements. Done means the duplicate entries, key mappings, names, and compositionstart data value match the cited specifications.