ci: re-add .appveyor.yml

Re-introduce default config file for use with repositories
other than the main ones.

.appveyor.yml

@@ -0,0 +1,143 @@
+# Appveyor configuration file for EPICS Base 7 builds
+# (see also https://github.com/epics-base/ci-scripts)
+
+# Version format
+version: base-{branch}-{build}
+
+#---------------------------------#
+#       build cache               #
+#---------------------------------#
+# The AppVeyor cache allowance is way too small (1GB per account across all projects, branches and jobs)
+# to be used for the dependency builds.
+
+cache:
+  - C:\Users\appveyor\.tools
+
+#---------------------------------#
+#       repository cloning        #
+#---------------------------------#
+
+# Called at very beginning, before repo cloning
+init:
+  # Set autocrlf to make batch files work
+  - git config --global core.autocrlf true
+
+# Set clone depth (do not fetch complete history)
+clone_depth: 5
+
+# Skipping commits affecting only specific files
+skip_commits:
+  files:
+    - 'documentation/*'
+    - 'startup/*'
+    - '.github/*'
+    - '**/*.html'
+    - '**/*.md'
+
+#---------------------------------#
+#   build matrix configuration    #
+#---------------------------------#
+
+image: Visual Studio 2015
+
+# Build Configurations: dll/static, regular/debug
+configuration:
+  - dynamic
+  - static
+  - dynamic-debug
+  - static-debug
+
+# Environment variables: compiler toolchain, base version, setup file, ...
+environment:
+  # common / default variables for all jobs
+  SETUP_PATH: .ci-local:.ci
+  BASE: SELF
+  EPICS_TEST_IMPRECISE_TIMING: YES
+
+  matrix:
+  - CMP: vs2019
+    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+  - CMP: vs2017
+    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+  - CMP: vs2015
+  - CMP: vs2013
+  - CMP: vs2012
+  - CMP: vs2010
+  - CMP: gcc
+
+# Platform: processor architecture
+platform:
+  - x86
+  - x64
+
+# Matrix configuration: exclude sets of jobs
+matrix:
+  exclude:
+  # VS2012 and older installs don't have the 64 bit compiler
+  - platform: x64
+    CMP: vs2012
+  - platform: x64
+    CMP: vs2010
+  # Exclude more jobs to reduce build time
+  # Skip 32-bit for "middle-aged" compilers
+  - platform: x86
+    CMP: vs2017
+  - platform: x86
+    CMP: vs2015
+  # MinGW debug builds use the same libraries, unlike VS
+  - configuration: dynamic-debug
+    CMP: gcc
+  - configuration: static-debug
+    CMP: gcc
+
+#---------------------------------#
+#     building & testing          #
+#---------------------------------#
+
+install:
+  - cmd: git submodule update --init --recursive
+  - cmd: pip install git+https://github.com/mdavidsaver/ci-core-dumper#egg=ci-core-dumper
+  - cmd: python .ci/cue.py prepare
+
+build_script:
+  - cmd: python .ci/cue.py build
+
+test_script:
+  - cmd: python -m ci_core_dumper install
+  - cmd: python .ci/cue.py test
+
+on_finish:
+  - ps: Get-ChildItem *.tap -Recurse -Force | % { Push-AppveyorArtifact $_.FullName -FileName $_.Name }
+  - cmd: python .ci/cue.py build test-results -s
+
+on_failure:
+  - cmd: python -m ci_core_dumper report
+
+#---------------------------------#
+#         debugging               #
+#---------------------------------#
+
+## if you want to connect by remote desktop to a failed build, uncomment these lines
+## note that you will need to connect within the usual build timeout limit (60 minutes)
+## so you may want to adjust the build matrix above to just build the one of interest
+
+# print the connection info
+#init:
+#  - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+
+# block a failed build (until the watchdog barks)
+#on_failure:
+#  - ps: $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+
+#---------------------------------#
+#         notifications           #
+#---------------------------------#
+
+notifications:
+
+  - provider: Email
+    to:
+      - core-talk@aps.anl.gov
+    on_build_success: false
+
+  - provider: GitHubPullRequest