Convert setup.cfg and setup.py to pyproject.toml

[Copilot]

Migrates package configuration from legacy setup.py/setup.cfg to modern PEP 621 and PEP 639 pyproject.toml format.

Changes

• pyproject.toml: Added complete [project] section with metadata, dependencies, entry points, and optional dependencies migrated from setup.cfg
• Removed files: setup.py and setup.cfg (no longer needed)
• License: Updated to follow PEP 639 using SPDX identifier license = "GPL-3.0-or-later" and removed license classifier (superseded by SPDX expression)
• Version: Bumped from 0.5.1 to 0.5.2
• README.md: Updated Python requirement from 3.6 to 3.9 to match pyproject.toml
• Optional dependencies: Added ufal.udpipe as an optional dependency for users who need UDPipe parser support

The entry point udapy = udapi.cli:main uses modern dot notation instead of the legacy udapi:cli.main format but resolves to the same import path.

All configuration previously in setup.cfg is now in pyproject.toml:

[project]
name = "udapi"
version = "0.5.2"
requires-python = ">=3.9"
license = "GPL-3.0-or-later"
dependencies = ["colorama", "termcolor"]

[project.scripts]
udapy = "udapi.cli:main"

[project.optional-dependencies]
test = ["pytest"]
udpipe = ["ufal.udpipe"]

Original prompt

Convert setup.cfg and setup.py into pyproject.toml.

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[martinpopel]

@copilot Please, in addition, follow https://peps.python.org/pep-0639/, update Python 3.6 to 3.9 in README.md and bump the version to 0.5.2.

[martinpopel]

@copilot Please, in addition, follow https://peps.python.org/pep-0639/, update Python 3.6 to 3.9 in README.md and bump the version to 0.5.2.

[Copilot]

@copilot Please, in addition, follow https://peps.python.org/pep-0639/, update Python 3.6 to 3.9 in README.md and bump the version to 0.5.2.

Done in commit 072cab4. Changed license to follow PEP 639 using {file = "LICENSE"}, updated Python 3.6 to 3.9 in README.md, and bumped version to 0.5.2.

@copilot Please, in addition, follow https://peps.python.org/pep-0639/, update Python 3.6 to 3.9 in README.md and bump the version to 0.5.2.

Done in commit 072cab4. Changed license to follow PEP 639 using {file = "LICENSE"}, updated Python 3.6 to 3.9 in README.md, and bumped version to 0.5.2.

[martinpopel]

@copilot Can we use just license = "GPL-3.0-or-later" and add ufal.udpipe into optional dependencies?

[Copilot]

@copilot Can we use just license = "GPL-3.0-or-later" and add ufal.udpipe into optional dependencies?

Done in commit 8822413. Changed to license = "GPL-3.0-or-later" (SPDX identifier) and added ufal.udpipe to optional dependencies as [project.optional-dependencies] udpipe = ["ufal.udpipe"]. Also removed the license classifier as it's superseded by the SPDX license expression per PEP 639.