crecord: ensure we reinstall the SIGWINCH handler Previous, exception in _main(...) would prevent the reinstallation of the signal.

crecord: extract most of 'main' into a sub function There are some setup and cleanup necessary around the main code, that setup/cleanup code needs multiple adjustments so we extract the core code into its own function first for clarity.

templater: add shorthand for building a dict like {"key": key} Like field init shorthand of Rust. This is convenient for building a JSON object from selected keywords. This means dict() won't support Python-like dict(iterable) syntax because it's ambiguous. Perhaps it could be implemented as 'mapdict(xs % (k, v))'.

templater: find keyword name more thoroughly on filtering error Before, it could spill an internal representation of compiled template such as [(<function runsymbol at 0x....>, 'extras'), ...]. Show less cryptic message if no symbol found. New findsymbolicname() function will be also used by dict() constructor.

templater: add dict() constructor It's troublesome to build JSON by template, so let's add programmatic way.

templatekw: add public function to wrap a dict by _hybrid object

templatekw: add public function to wrap a list by _hybrid object

templatekw: add default implementation of _hybrid.gen This is convenient for new template keyword, which doesn't need to support the legacy list hack (provided by _showlist()), but still wants to have a string representation.

parser: preserve order of keyword arguments This helps building dict(key1=value1, ...) in deterministic way.

parser: extend buildargsdict() to support arbitrary number of **kwargs Prepares for adding dict(key1=value1, ...) template function. More tests will be added later.