Added vscode debug, settings and extension config

.vscode/c_cpp_properties.json

@@ -0,0 +1,21 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "${workspaceFolder}/src/**",
+                "/usr/include/llvm-10/**",
+                "/usr/include/llvm-c-10/**",
+                "/usr/include/clang/**"
+            ],
+            "defines": [],
+            "compilerPath": "/usr/bin/clang-10",
+            "cStandard": "gnu17",
+            "cppStandard": "gnu++17",
+            "intelliSenseMode": "clang-x64",
+            "compileCommands": "${workspaceFolder}/build/compile_commands.json",
+            "configurationProvider": "ms-vscode.cmake-tools"
+        }
+    ],
+    "version": 4
+}

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        /* {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Launch",
+            "program": "${workspaceFolder}/bin/lsif-clang",
+            "args": ["build/compile_commands.json"],
+            "cwd": "${workspaceFolder}/src"
+        }, */
+        {
+            "name": "(gdb) Launch",
+            "type": "cppdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/bin/lsif-clang",
+            "args": ["build/compile_commands.json"],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}/src",
+            "environment": [],
+            "externalConsole": false,
+            "MIMode": "gdb",
+            "additionalSOLibSearchPath": "/usr/lib/x86_64-linux-gnu/debug/;/usr/lib/x86_64-linux-gnu/debug/",
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                },
+                {
+                    "description": "Auto load symbols when loading an .so file",
+                     "text": "set auto-solib-add",
+                     "ignoreFailures": false
+                }
+            ]
+        }
+    ]
+}

.vscode/settings.json

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+{
+    // we keep this extension for debugging
+    "C_Cpp.intelliSenseEngine": "Disabled",
+    "C_Cpp.autocomplete": "Disabled",  // So you don't get autocomplete from both extensions.
+    "C_Cpp.errorSquiggles": "Disabled", // So you don't get error squiggles from both extensions (clangd's seem to be more reliable anyway).
+    "clangd.path": "/usr/bin/clangd",
+    "clangd.arguments": ["-pretty", "--background-index", "--compile-commands-dir=/workspace/lsif-clang"],
+    "[cpp]": {
+        "editor.tabSize": 2,
+        "editor.insertSpaces": true
+    },
+    "cmake.configureOnOpen": false,
+    "cmake.configureOnEdit": false,
+}