replaced gnu-make with pyinvoke

Makefile

@@ -1,9 +0,0 @@
-dist/tacview-splitter: tacview-splitter.py
-	pyinstaller --onefile tacview-splitter.py
-
-clean:
-	rm -rf build __pycache__ tacview-splitter.spec
-
-distclean: clean
-	rm -rf dist
-

tasks.py

@@ -0,0 +1,47 @@
+from invoke import task
+
+
+@task
+def build(c):
+    c.run("pyinstaller --onefile tacview-splitter.py")
+
+
+@task
+def clean(c):
+    c.run("rm -rf build __pycache__ tacview-splitter.spec")
+
+
+@task(pre=[clean])
+def distclean(c):
+    c.run("rm -rf dist release")
+
+
+@task(pre=[build])
+def release(c, version):
+    c.run(f"""
+    mkdir -p release/linux/tacview-splitter-{version}
+    mkdir -p release/win/tacview-splitter-{version}
+    cd release/linux/tacview-splitter-{version}
+    cp ../../../README.md .
+    cp ../../../LICENSE .
+    cp ../../../dist/tacview-splitter .
+    cd ..
+    tar -cvzf tacview-splitter-linux_x86-64.tar.gz tacview-splitter-{version}
+    mv tacview-splitter-linux_x86-64.tar.gz ..
+
+    cd ../win/tacview-splitter-{version}
+    cp ../../../README.md .
+    cp ../../../LICENSE LICENSE.txt
+    echo Copy the windows release file into the following directory:
+    pwd
+    echo -n then press enter ...
+    read
+    cd ..
+    7z a tacview-splitter-win_x86-64.zip tacview-splitter-{version}
+    mv tacview-splitter-win_x86-64.zip ..
+
+    cd ..
+    rm -f sha256sums.txt
+    sha256sum tacview-splitter-win_x86-64.zip tacview-splitter-linux_x86-64.tar.gz >> sha256sums.txt
+    sha256sum --check sha256sums.txt
+    """)