Upgraded to pyproject/flit build style

pyproject.toml

@@ -0,0 +1,43 @@
+[build-system]
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"
+
+[project]
+name = "ptulsconv"
+authors = [
+    {name = "Jamie Hardt", email = "jamiehardt@me.com"},
+]
+readme = "README.md"
+license = { file = "LICENSE" }
+classifiers = [
+    'License :: OSI Approved :: MIT License',
+    'Topic :: Multimedia',
+    'Topic :: Multimedia :: Sound/Audio',
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Development Status :: 5 - Production/Stable",
+    "Topic :: Text Processing :: Filters"
+]
+requires-python = ">=3.7"
+dynamic = ["version", "description"]
+keywords = ["text-processing", "parsers", "film", 
+    "broadcast", "editing", "editorial"]
+dependencies = ['parsimonious', 'tqdm', 'reportlab']
+
+[project.optional-dependencies]
+doc = [
+    "Sphinx ~= 5.3.0",
+    "sphinx-rtd-theme >= 1.1.1"
+]
+
+[project.scripts]
+flit = "ptulsconv.__main__:main"
+
+
+[project.urls]
+Source = 'https://github.com/iluvcapra/ptulsconv'
+Issues = 'https://github.com/iluvcapra/ptulsconv/issues'
+Documentation = 'https://ptulsconv.readthedocs.io/'