first draft of commandline-editing commands ({ and } as in VideoTECO)

 * simplified traditional commandline editing. no need to extend cmdline string one character
   at a time when inserting multiple. instead there's a marker (cmdline_pos) specifying the macro
   length to execute in a "step" and also the anchor for generating undo tokens
 * implementation does not yet work in macro calls
 * while editing the commandline, other buffers/registers may not be edited
   (need push-down-list and auxiliary q-register)

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