Update core dep resolution functionality to use poetry compat checks

Remove custom package compatibility checks
Add checks using poetry's built in package compatibility checking using markers
Update venv integration to use poetry's venv processing tools
Remove unused constants

tox_poetry_installer/constants.py

@@ -5,11 +5,8 @@ in this module.
 
 All constants should be type hinted.
 """
-import sys
 from typing import Tuple
 
-from poetry.core.semver.version import Version
-
 from tox_poetry_installer import __about__
 
 
@@ -20,12 +17,3 @@ PEP508_VERSION_DELIMITERS: Tuple[str, ...] = ("~=", "==", "!=", ">", "<")
 # Prefix all reporter messages should include to indicate that they came from this module in the
 # console output.
 REPORTER_PREFIX: str = f"{__about__.__title__}:"
-
-
-# Semver compatible version of the current python platform version. Used for checking
-# whether a package is compatible with the current python system version
-PLATFORM_VERSION: Version = Version(
-    major=sys.version_info.major,
-    minor=sys.version_info.minor,
-    patch=sys.version_info.micro,
-)