Set up clangd for intellisense. Whoof, that was difficult.

Integration.code-workspace.tpl.json

@@ -36,10 +36,18 @@
             "**/x86_64-linux-gnu/**": "cpp",
             "*.ipp": "cpp",
             "*.inc": "cpp"
-        }
+        },
+        "C_Cpp.intelliSenseEngine": "disabled",
+        "clangd.path": "/usr/bin/clangd-15",
+        "clangd.arguments": [
+          "--compile-commands-dir=[INTEGRATION]/.vscode",
+          "--header-insertion=never"
+        ],
+        "C_Cpp.autocomplete": "Disabled"
     },
     "extensions": {
         "recommendations": [
+            "llvm-vs-code-extensions.vscode-clangd",
             "vadimcn.vscode-lldb",
             "dfarley1.file-picker",
             "ms-python.python",
@@ -73,6 +81,16 @@
                 },
                 "problemMatcher": "$msCompile",
                 "type": "shell"
+            },
+            {
+                "label": "Make Intellisense",
+                "group": "build",
+                "command": "make intellisense",
+                "presentation": {
+                    "clear": true
+                },
+                "problemMatcher": "$msCompile",
+                "type": "shell"
             }
         ]
     },
@@ -103,4 +121,4 @@
             }
         }
     }
-}
+}