Move to gitlab for CI (Rye's work but ported)

d3ddcdae: Update various urls from bitbucket to new alchemy gitlab
c24b176d: Standardize on one vc directory name for ease of build automation
Also add .gitlab-ci.yml

Thanks for the help, Rye!

autobuild.xml

@@ -2981,7 +2981,7 @@
         <key>windows</key>
         <map>
           <key>build_directory</key>
-          <string>build-vc${AUTOBUILD_WIN_VSVER|161}-$AUTOBUILD_ADDRSIZE</string>
+          <string>build-vc-$AUTOBUILD_ADDRSIZE</string>
           <key>configurations</key>
           <map>
             <key>RelWithDebInfo</key>
@@ -3040,6 +3040,7 @@
                   <string>/p:Configuration=Release</string>
                   <string>/p:Platform=${AUTOBUILD_WIN_VSPLATFORM|NOTWIN}</string>
                   <string>/t:Build</string>
+                  <string>/p:PreferredToolArchitecture=x64</string>
                   <string>/p:useenv=true</string>
                   <string>/verbosity:normal</string>
                   <string>/m</string>