switch to xmake for package management (#611)

This change removes our dependency on vcpkg for package management, in favour of bringing some code in-tree in the `thirdparty` folder as well as using the xmake build-in package management feature. For the latter, all the package definitions are maintained in the zen repo itself, in the `repo` folder.

It should now also be easier to build the project as it will no longer depend on having the right version of vcpkg installed, which has been a common problem for new people coming in to the codebase. Now you should only need xmake to build.

* Bumps xmake requirement on github runners to 2.9.9 to resolve an issue where xmake on Windows invokes cmake with `v144` toolchain which does not exist
* BLAKE3 is now in-tree at `thirdparty/blake3`
* cpr is now in-tree at `thirdparty/cpr`
* cxxopts is now in-tree at `thirdparty/cxxopts`
* fmt is now in-tree at `thirdparty/fmt`
* robin-map is now in-tree at `thirdparty/robin-map`
* ryml is now in-tree at `thirdparty/ryml`
* sol2 is now in-tree at `thirdparty/sol2`
* spdlog is now in-tree at `thirdparty/spdlog`
* utfcpp is now in-tree at `thirdparty/utfcpp`
* xmake package repo definitions is in `repo`
* implemented support for sanitizers. ASAN is supported on windows, TSAN, UBSAN, MSAN etc are supported on Linux/MacOS though I have not yet tested it extensively on MacOS
* the zencore encryption implementation also now supports using mbedTLS which is used on MacOS, though for now we still use openssl on Linux
* crashpad
* bumps libcurl to 8.11.0 (from 8.8.0) which should address a rare build upload bug

1 files changed, 61 insertions, 0 deletions

diff --git a/thirdparty/fmt/doc/fmt.css b/thirdparty/fmt/doc/fmt.css
new file mode 100644
index 000000000..994d6e2e9
--- /dev/null
+++ b/thirdparty/fmt/doc/fmt.css
@@ -0,0 +1,61 @@
+:root {
+  --md-primary-fg-color: #0050D0;
+}
+
+.md-grid {
+  max-width: 960px;
+}
+
+@media (min-width: 400px) {
+  .md-tabs {
+    display: block;
+  }
+}
+
+.docblock {
+  border-left: .05rem solid var(--md-primary-fg-color);
+}
+
+.docblock-desc {
+  margin-left: 1em;
+}
+
+pre > code.decl {
+  white-space: pre-wrap;
+}
+
+
+code.decl > div {
+  text-indent: -2ch; /* Negative indent to counteract the indent on the first line */
+  padding-left: 2ch; /* Add padding to the left to create an indent */
+}
+
+.features-container {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 20px;
+  justify-content: center; /* Center the items horizontally */
+}
+
+.feature {
+  flex: 1 1 calc(50% - 20px); /* Two columns with space between */
+  max-width: 600px; /* Set the maximum width for the feature boxes */
+  box-sizing: border-box;
+  padding: 10px;
+  overflow: hidden; /* Hide overflow content */
+  text-overflow: ellipsis; /* Handle text overflow */
+  white-space: normal; /* Allow text wrapping */
+}
+
+.feature h2 {
+  margin-top: 0px;
+  font-weight: bold;
+}
+
+@media (max-width: 768px) {
+  .feature {
+      flex: 1 1 100%; /* Stack columns on smaller screens */
+      max-width: 100%; /* Allow full width on smaller screens */
+      white-space: normal; /* Allow text wrapping on smaller screens */
+  }
+}