Import YEEP-144 library 1.2 sources

Source-only snapshot of the 1.2 release. Drivers/ (the vendored ST HAL and
CMSIS) is excluded at 173 MB; fetch it from STMicroelectronics/STM32CubeH5 to
build.

.vscode/tasks.json

@@ -0,0 +1,65 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "shell",
+			"label": "CubeProg: Flash project (SWD)",
+			"command": "cube",
+			"args": [
+				"programmer",
+				"--connect",
+				"port=swd",
+				"--download",
+				"${command:cmake.launchTargetPath}",
+				"-hardRst",
+				"-rst",
+				"--start"
+			],
+			"options": {
+				"cwd": "${workspaceFolder}"
+			},
+			"problemMatcher": [],
+			"presentation": {
+				"showReuseMessage": false
+			}
+		},
+		{
+			"label": "Build + Flash",
+			"dependsOrder": "sequence",
+			"dependsOn": [
+				"CMake: clean rebuild",
+				"CubeProg: Flash project (SWD)"
+			],
+			"problemMatcher": [
+				"$gcc"
+			],
+			"presentation": {
+				"showReuseMessage": false
+			}
+		},
+		{
+			"type": "cmake",
+			"label": "CMake: clean rebuild",
+			"command": "cleanRebuild",
+			"targets": [
+				"all"
+			],
+			"preset": "Debug",
+			"group": "build",
+			"problemMatcher": [],
+			"detail": "CMake template clean rebuild task"
+		},
+		{
+			"type": "cmake",
+			"label": "CMake: configure",
+			"command": "configure",
+			"preset": "Debug",
+			"problemMatcher": [],
+			"detail": "CMake template configure task"
+		},
+		{
+			"label": "Configure and Build",
+			"dependsOn": ["CMake: configure", "${command:st-stm32-ide-debug-launch.build}"],
+			"dependsOrder": "sequence"}
+		]
+	}