Path fixes for simulator (#357)

Tactility/Include/Tactility/Assets.h

@@ -1,6 +1,11 @@
 #pragma once
 
+/**
+ * Deprecated list of LVGL asset folder paths>
+ */
+
 #define TT_ASSET_FOLDER "A:/system/"
+
 #define TT_ASSET(file) TT_ASSET_FOLDER file
 
 // UI

Tactility/Include/Tactility/lvgl/Lvgl.h

@@ -2,6 +2,14 @@
 
 namespace tt::lvgl {
 
+#ifdef ESP_PLATFORM
+static constexpr auto* PATH_PREFIX = "A:";
+#else
+// PC paths are relative, unlike ESP paths.
+// LVGL paths require a `/` prefix, so we have to add it here:
+static constexpr auto* PATH_PREFIX = "A:/";
+#endif
+
 bool isStarted();
 
 void start();