Calculate offsets for map and gfx

tools/asset_processor/offsets.cpp

@@ -0,0 +1,9 @@
+#include "offsets.h"
+
+OffsetCalculator::OffsetCalculator(std::filesystem::path outputFile, int baseOffset): baseOffset(baseOffset) {
+    output = std::ofstream(outputFile);
+}
+
+void OffsetCalculator::addAsset(int start, std::string symbol) {
+    this->output << "\t.equiv offset_" << symbol << ", " << start - this->baseOffset << std::endl;
+}