Bring up to current speccydev container tools

.devcontainer/devcontainer.json

@@ -1,7 +1,12 @@
 {
 	"name": "ZX Spectrum dev tools",
-	"image": "boarstone.mcphail.uk/mcphail/speccydev",
+	//"build": { "dockerfile": "Dockerfile" },
+	// The Dockerfile takes an age to build due to z88dk, so pull from prebuilt:
+	"image": "boarstone.mcphail.uk/mcphail/speccydev:stable",
 	"remoteUser": "ubuntu",
+	"runArgs": [
+		"--network=host"
+	],
 	"customizations": {
 		"vscode": {
 			"extensions": [
@@ -11,7 +16,9 @@
 				"maziac.hex-hover-converter",
 				"maziac.sna-fileviewer",
 				"maziac.nex-fileviewer",
-				"ms-vscode.makefile-tools"
+				"ms-vscode.makefile-tools",
+				"jsjlogin.zxbasic",
+				"thenestruo.z80-asm-meter"
 			]
 		}
 	}