Documented the recording control behaviour and implemented Cmd-W/Q.

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+This is an attempt to specify some of the parts of the library so that it’s easier to spot bugs and regressions.
+
+The specification is expected to grow incrementally, as the developers update various parts of the code. If you hack on a part of the library that would benefit from a precise specification and is not documented here yet, please consider adding to the specification.
+
+Please stay high-level when writing the spec, do not document particular classes or other implementation details. The spec should be usable as a testing scenario – you should be able to walk through the spec and verify correct code behaviour on the library demo app.
+
+# Recording Shortcuts
+
+* If a shortcut has no modifiers and is not a function key (F1–F20), it must be rejected. (Examples: `A`, Shift-A.)
+* If the shortcut is plain Esc without modifiers, it must be rejected and cancels the recording.
+* If the shortcut is plain Backspace or plain Delete, it must be rejected, clears the recorded shortcut and cancels the recording.
+* If the shortcut is Cmd-W or Cmd-Q, the recording must be cancelled and the keypress passed through to the system, closing the window or quitting the app.
+* If a shortcut is already taken by system and is enabled, it must be rejected. (Examples: Cmd-S, Cmd-N. TBD: What exactly does it mean that the shortcut is “enabled”?)
+* TBD: Option-key handling.
+* All other shortcuts must be accepted. (Examples: Ctrl-Esc, Cmd-Delete, F16.)
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