Fix cross import between `tools` and `client`

[junkmd]

Currently there are no problems at runtime, but complex imports tend to cause strange bugs that occur when the code is changed.

Modification policies

Make client dependent on tools.
So that client is not imported from tools, except to use as workarounds when there is nothing else to do.

[junkmd]

Generating modules in codegenerator

comtypes/comtypes/tools/codegenerator.py

Lines 669 to 679 in 944e279

	def External(self, ext):
	# ext.docs - docstring of typelib
	# ext.symbol_name - symbol to generate
	# ext.tlib - the ITypeLib pointer to the typelibrary containing the symbols definition
	#
	# ext.name filled in here
	modname = comtypes.client._generate._name_module(ext.tlib)
	if modname not in self.imports:
	comtypes.client.GetModule(ext.tlib)
	self.imports.add(modname)
	ext.name = "%s.%s" % (modname, ext.symbol_name)

The codegenerator is responsible for writing code to file I/O, but when generate_code is called, it generates the dependency modules.

Generating modules in the generating code process seems to be out of scope.

Generator is called by the client.

If generating dependency modules are necessary, I think that the Parser or Generator should have a method or attribute to obtain those COM libraries, and the process of generating modules should be done in the client.

[junkmd]

move tlbparser.generate_module to client._generate

comtypes/comtypes/tools/tlbparser.py

Lines 737 to 767 in 944e279

	def generate_module(tlib, ofi, pathname):
	known_symbols = {}
	for name in ("comtypes.persist",
	"comtypes.typeinfo",
	"comtypes.automation",
	"comtypes._others",
	"comtypes",
	"ctypes.wintypes",
	"ctypes"):
	try:
	mod = __import__(name)
	except ImportError:
	if name == "comtypes._others":
	continue
	raise
	for submodule in name.split(".")[1:]:
	mod = getattr(mod, submodule)
	for name in mod.__dict__:
	known_symbols[name] = mod.__name__
	p = TypeLibParser(tlib)
	if pathname is None:
	pathname = get_tlib_filename(tlib)
	items = p.parse()
	from .codegenerator import Generator
	gen = Generator(ofi,
	known_symbols=known_symbols,
	)
	gen.generate_code(list(items.values()), filename=pathname)

When I first saw the implementation of this library, I wondered why there was a generate_module in tools.tlbparser and not in tools.codegenerator or client._generate.

comtypes/comtypes/tools/codegenerator.py

Lines 1284 to 1287 in 944e279

	# shortcut for development
	if __name__ == "__main__":
	from . import tlbparser
	tlbparser.main()

I think the role of module generation should be in client._generate.

[junkmd]

this issue was closed since merging #342 and #348.