Add the STR RPC to overlord and game code (#134)

* work in progress streaming rpc, simple test is working

* actually add the test

* debug windows failure

* windows fix maybe

* windows 2

* use str-load-status

* update types

game/common/overlord_common.h

@@ -0,0 +1,3 @@
+#pragma once
+
+constexpr int SECTOR_SIZE = 0x800;  // media sector size

game/common/str_rpc_types.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "common/common_types.h"
+#include "game/common/overlord_common.h"
+
+constexpr int STR_RPC_ID = 0xdeb5;
+constexpr int STR_RPC_CHANNEL = 4;
+
+struct RPC_Str_Cmd {
+  u16 rsvd;       // 0, seems unused
+  u16 result;     // 2, return code. see STR_RPC_RESULT_XXX
+  u32 ee_addr;    // 4, GOAL address to load to.
+  s32 chunk_id;   // 8, chunk ID for chunked file. Use -1 to load a non-chunked file, which gets the
+                  // whole file.
+  u32 length;     // 12, length that was actually loaded
+  char name[64];  // file name
+};
+
+constexpr int STR_RPC_RESULT_ERROR = 1;
+constexpr int STR_RPC_RESULT_DONE = 0;
+
+// maximum number of chunks in a chunked file.
+constexpr int SECTOR_TABLE_SIZE = 64;
+
+// the header of a chunked file
+struct StrFileHeader {
+  u32 sectors[SECTOR_TABLE_SIZE];  // start of chunk, in sectors. including this sector.
+  u32 sizes[SECTOR_TABLE_SIZE];    // size of chunk, in bytes. always an integer number of sectors
+};
+
+// the first sector of a chunked file.
+struct StrFileHeaderSector : StrFileHeader {
+  u32 pad[512 - 128];  // all zero
+};
+
+static_assert(sizeof(StrFileHeader) == 0x200, "Sector header size");
+static_assert(sizeof(StrFileHeaderSector) == SECTOR_SIZE, "Sector header size");