modules: rename qt.py -> _qt.py

Since it's an implementation detail, and shouldn't be exposed. This also
helps give better error messages when a user writes `import('qt')`,
since otherwise you get an error about `qt doesn't have an initialize
method`, and now you get `qt module doesn't exist`.

mesonbuild/modules/qt4.py

@@ -4,7 +4,7 @@
 from __future__ import annotations
 import typing as T
 
-from .qt import QtBaseModule
+from ._qt import QtBaseModule
 from . import ModuleInfo
 
 if T.TYPE_CHECKING:

mesonbuild/modules/qt5.py

@@ -4,7 +4,7 @@
 from __future__ import annotations
 import typing as T
 
-from .qt import QtBaseModule
+from ._qt import QtBaseModule
 from . import ModuleInfo
 
 if T.TYPE_CHECKING:

mesonbuild/modules/qt6.py

@@ -4,7 +4,7 @@
 from __future__ import annotations
 import typing as T
 
-from .qt import QtBaseModule
+from ._qt import QtBaseModule
 from . import ModuleInfo
 
 if T.TYPE_CHECKING:

run_mypy.py

@@ -62,7 +62,7 @@ modules = [
     'mesonbuild/modules/keyval.py',
     'mesonbuild/modules/modtest.py',
     'mesonbuild/modules/pkgconfig.py',
-    'mesonbuild/modules/qt.py',
+    'mesonbuild/modules/_qt.py',
     'mesonbuild/modules/qt4.py',
     'mesonbuild/modules/qt5.py',
     'mesonbuild/modules/qt6.py',

unittests/datatests.py

@@ -201,7 +201,7 @@ class DataTests(unittest.TestCase):
             html = f.read().lower()
         self.assertIsNotNone(html)
         for f in Path('mesonbuild/modules').glob('*.py'):
-            if f.name in {'modtest.py', 'qt.py', '__init__.py'}:
+            if f.name.startswith('_') or f.name == 'modtest.py':
                 continue
             name = f'{f.stem}-module.html'
             name = name.replace('unstable_', '')