Copy changes from the no-history fork, generated back in 2023

Original commit message:
> commit f138311d2d2e0cc9ba0496d523bb46f2c1c9fb73
> Author: rtk0c <[email protected]>
> Date:   Wed Sep 20 23:58:58 2023 -0700
>
>     Copy from the PlasticSCM repo, replace vendored glm wtih conan

In reality, this also introduced a few uncommitted changes in the
original PlasticSCM repo. See the modified and new files in this patch.

1 files changed, 0 insertions, 47 deletions

diff --git a/3rdparty/glfw/source/.appveyor.yml b/3rdparty/glfw/source/.appveyor.yml
deleted file mode 100644
index 2742949..0000000
--- a/3rdparty/glfw/source/.appveyor.yml
+++ /dev/null
@@ -1,47 +0,0 @@
-image:
-    - Visual Studio 2015
-branches:
-    only:
-        - ci
-        - master
-        - latest
-        - 3.3-stable
-skip_tags: true
-environment:
-    matrix:
-        - GENERATOR: MinGW Makefiles
-          BUILD_SHARED_LIBS: ON
-          CFLAGS: -Werror
-        - GENERATOR: MinGW Makefiles
-          BUILD_SHARED_LIBS: OFF
-          CFLAGS: -Werror
-        - GENERATOR: Visual Studio 10 2010
-          BUILD_SHARED_LIBS: ON
-          CFLAGS: /WX
-        - GENERATOR: Visual Studio 10 2010
-          BUILD_SHARED_LIBS: OFF
-          CFLAGS: /WX
-matrix:
-    fast_finish: true
-for:
--
-    matrix:
-        only:
-            - GENERATOR: MinGW Makefiles
-    build_script:
-        - set PATH=%PATH:C:\Program Files\Git\usr\bin=C:\MinGW\bin%
-        - cmake -S . -B build -G "%GENERATOR%" -DBUILD_SHARED_LIBS=%BUILD_SHARED_LIBS%
-        - cmake --build build
--
-    matrix:
-        only:
-            - GENERATOR: Visual Studio 10 2010
-    build_script:
-        - cmake -S . -B build -G "%GENERATOR%" -DBUILD_SHARED_LIBS=%BUILD_SHARED_LIBS%
-        - cmake --build build --target glfw
-notifications:
-    - provider: Email
-      to:
-        - [email protected]
-      on_build_failure: true
-      on_build_success: false