Implement raw DeviceMonitor

Multiple things have been done in this commit; the base of the new
backend has effectively been created. This branch currently has many
vital parts commented out. Therefore, this branch is currently only
intended for debugging.

src/logid/backend/dj/Report.cpp

@@ -0,0 +1,32 @@
+#include <array>
+#include <algorithm>
+#include "Report.h"
+
+using namespace logid::backend::dj;
+using namespace logid::backend;
+
+static const std::array<uint8_t, 35> DJReportDesc = {
+        0xA1, 0x01,        // Collection (Application)
+        0x85, 0x20,        //   Report ID (32)
+        0x95, 0x0E,        //   Report Count (14)
+        0x75, 0x08,        //   Report Size (8)
+        0x15, 0x00,        //   Logical Minimum (0)
+        0x26, 0xFF, 0x00,  //   Logical Maximum (255)
+        0x09, 0x41,        //   Usage (0x41)
+        0x81, 0x00,        //   Input (Data, Array, Absolute)
+        0x09, 0x41,        //   Usage (0x41)
+        0x91, 0x00,        //   Output (Data, Array, Absolute)
+        0x85, 0x21,        //   Report ID (33)
+        0x95, 0x1F,        //   Report Count (31)
+        0x09, 0x42,        //   Usage (0x42)
+        0x81, 0x00,        //   Input (Data, Array, Absolute)
+        0x09, 0x42,        //   Usage (0x42)
+        0x91, 0x00,        //   Output (Data, Array, Absolute)
+        0xC0               // End Collection
+};
+
+bool dj::supportsDjReports(std::vector<uint8_t>& rdesc)
+{
+    auto it = std::search(rdesc.begin(), rdesc.end(), DJReportDesc.begin(), DJReportDesc.end());
+    return it != rdesc.end();
+}