Use Github Actions instead of Travis

Moved MSVC to Github Actions as well.

.ci/common/post-upload.sh

@@ -0,0 +1,12 @@
+#!/bin/bash -ex
+
+# Copy documentation
+cp license.txt "$REV_NAME"
+cp README.md "$REV_NAME"
+
+cp dist/threeSDumper.gm9 "$REV_NAME/dist"
+
+7z a "$REV_NAME.zip" $REV_NAME
+
+# move the compiled archive into the artifacts directory to be uploaded by gh action releases
+mv "$REV_NAME.zip" artifacts/

.ci/common/pre-upload.sh

@@ -0,0 +1,11 @@
+#!/bin/bash -ex
+
+GITDATE="`git show -s --date=short --format='%ad' | sed 's/-//g'`"
+GITREV="`git show -s --format='%h'`"
+if [[ $GITHUB_REF == refs/tags/* ]]; then
+    GITNAME="${GITHUB_REF:10}"
+else
+    GITNAME="${GITDATE}-${GITREV}"
+fi
+
+mkdir -p artifacts