LSP: initial LSP implementation for IR files to assist with decompilation (#1647)

* lsp: json-rpc example is working, a decent place to start...

* lsp: vendor library

* lsp: cleanup and time to get started

* lsp: commit what i got so far

* lsp: example `initialize` payload

* lsp: switch to `stdio`

* stash

* modularize the lsp implementation

* lsp: implement first actual LSP feature - function names in outline

* lsp: produce document diagnostics

* lsp: remove unused third-party lib

* lsp: support hovering MIPS instructions in IR files

* lsp: basic go-to all-types definition

* stash

* lsp: cleanup code, just need to add it to the release artifacts

* fix some project configuration

* fix linux build

* lsp: add lsp to PR artifacts and release assets

* lsp: address feedback

lsp/protocol/hover.cpp

@@ -0,0 +1,24 @@
+#include "hover.h"
+
+void LSPSpec::to_json(json& j, const MarkupContent& obj) {
+  j = json{{"kind", obj.m_kind}, {"value", obj.m_value}};
+}
+
+void LSPSpec::from_json(const json& j, MarkupContent& obj) {
+  j.at("kind").get_to(obj.m_kind);
+  j.at("value").get_to(obj.m_value);
+}
+
+void LSPSpec::to_json(json& j, const Hover& obj) {
+  j = json{{"contents", obj.m_contents}};
+  if (obj.m_range) {
+    j["range"] = obj.m_range.value();
+  }
+}
+
+void LSPSpec::from_json(const json& j, Hover& obj) {
+  j.at("contents").get_to(obj.m_contents);
+  if (j.contains("range")) {
+    obj.m_range = std::make_optional(j.at("range").get<Range>());
+  }
+}