Align board project names with board ids (#399)

To avoid keeping track of a list that maps board project names to board ids.
Because of this change, we don't have to manually edit `boards.cmake` anymore when adding a new board.

Boards/lilygo-tdeck/Source/devices/Power.cpp

@@ -0,0 +1,10 @@
+#include <ChargeFromAdcVoltage.h>
+#include <EstimatedPower.h>
+
+std::shared_ptr<PowerDevice> createPower() {
+    ChargeFromAdcVoltage::Configuration configuration;
+    // 2.0 ratio, but +.11 added as display voltage sag compensation.
+    configuration.adcMultiplier = 2.11;
+
+    return std::make_shared<EstimatedPower>(configuration);
+}