Move all the diffuse package in its own directory

This helps the linters (pylint and flake8)

Author: MightyCreak

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Pylint
       uses: cclauss/GitHub-Action-for-pylint@master
       with:
-        args: "pylint src/vcs/ src/dialogs.py src/preferences.py src/resources.py src/utils.py src/widgets.py"
+        args: "pylint src/**/*.py"
 
   meson-build-test:
     runs-on: ubuntu-latest

.pylintrc

@@ -24,7 +24,7 @@ ignore=CVS
 
 # Add files or directories matching the regex patterns to the ignore-list. The
 # regex matches against paths.
-ignore-paths=
+ignore-paths=src/diffuse/main.py
 
 # Files or directories matching the regex patterns are skipped. The regex
 # matches against base names, not paths.

src/__init__.py src/diffuse/__init__.pysrc/__init__.py renamed to src/diffuse/__init__.py

@@ -0,0 +1,46 @@
+pkgdatadir = join_paths(get_option('prefix'), get_option('datadir'), meson.project_name())
+moduledir = join_paths(pkgdatadir, 'diffuse')
+sysconfdir = join_paths(get_option('prefix'), get_option('sysconfdir'))
+
+python = import('python')
+
+conf = configuration_data()
+conf.set('PYTHON', python.find_installation('python3').path())
+conf.set('pkgdatadir', pkgdatadir)
+conf.set('localedir', join_paths(get_option('prefix'), get_option('localedir')))
+
+configure_file(
+  input: 'diffuse.in',
+  output: 'diffuse',
+  configuration: conf,
+  install: true,
+  install_dir: get_option('bindir')
+)
+
+conf = configuration_data()
+conf.set('VERSION', meson.project_version())
+conf.set('sysconfigdir', sysconfdir)
+conf.set('log_print_output', get_option('log_print_output'))
+conf.set('log_print_stack', get_option('log_print_stack'))
+conf.set('use_flatpak', get_option('use_flatpak'))
+
+configure_file(
+  input: 'constants.py.in',
+  output: 'constants.py',
+  configuration: conf,
+  install: true,
+  install_dir: moduledir
+)
+
+diffuse_sources = [
+  '__init__.py',
+  'dialogs.py',
+  'main.py',
+  'preferences.py',
+  'resources.py',
+  'utils.py',
+  'widgets.py',
+]
+
+install_data(diffuse_sources, install_dir: moduledir)
+install_subdir('vcs', install_dir: moduledir, strip_directory: false)