travis: Split build scripts for different platforms

This commit also separates clang-format from the linux build, closing #2702.

.travis/common/post-upload.sh

@@ -0,0 +1,22 @@
+#!/bin/bash -ex
+
+# Copy documentation
+cp license.txt "$REV_NAME"
+cp README.md "$REV_NAME"
+
+tar $COMPRESSION_FLAGS "$ARCHIVE_NAME" "$REV_NAME"
+
+# Find out what release we are building
+if [ -z $TRAVIS_TAG ]; then
+    RELEASE_NAME=head
+else
+    RELEASE_NAME=$(echo $TRAVIS_TAG | cut -d- -f1)
+fi
+
+mv "$REV_NAME" $RELEASE_NAME
+
+7z a "$REV_NAME.7z" $RELEASE_NAME
+
+# move the compiled archive into the artifacts directory to be uploaded by travis releases
+mv "$ARCHIVE_NAME" artifacts/
+mv "$REV_NAME.7z" artifacts/