optimized command execution in batch mode, during macro calls, loops etc.

 * SciTECO commands are implemented with immediate execution in mind.
   Those commands that do need to execute immediately while a string
   command is entered, can do so using StateExpectString::process().
   For simplicity, the parser just assumed that every input character
   should result in immediate execution (if the command supports it
   of course).
 * This lead to unnecessarily slow execution of commands like <I> or
   <S> in batch mode. E.g. a search was always repeated for every
   character of the pattern - a N character pattern could result in
   N searches instead of one.
   Also in interactive mode when executing a macro
   or repeating commands in a loop, immediate processing of string arguments
   is unnecessary and results in superfluous undo tokens.
 * These cases are all optimized now by being informed about
   the necessity of providing immediate feedback via State::refresh().
   This is used by StateExpectString to defer calling process() as
   long as possible.
 * For states extending StateExpectString, there is no change since
   they can already process arbitrarily long strings.
   The optimization is hidden in StateExpectString.
 * some allocations are now also avoided in StateExpectString::custom().

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