C++ refactoring, plus low-power support, plus software-based SPI CS

I'm backlogged.

Main.cpp.bak

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2019  Max Regan
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+// TODO: Make a better "system" include
+#include "stm32l0xx.h"
+
+#include "ConcreteTaskScheduler.h"
+#include "SpiDriver.h"
+#include "DisplayDriver.h"
+
+using Common::Schedule::TaskScheduler;
+
+static Common::Schedule::ConcreteTaskScheduler<10> g_scheduler;
+static BSP::SpiDriver g_spi1(g_scheduler, SPI1);
+static BSP::DisplayDriver g_display(g_scheduler, g_spi1);
+
+[[noreturn]] void main()
+{
+    g_spi1.init();
+    g_display.init();
+    g_scheduler.run();
+}