dbg_engine: shift thread register reads / process memory reads -> abstraction layer, rather than directly calling into demon; cache crash dump info, like thread info & memory ranges; implement thread reg reads & memory reads for dumps by using this acceleration structure when we have a dump handle, instead of regular demon reads.

src/minidump/minidump.h

@@ -4,6 +4,8 @@
 #ifndef MINIDUMP_H
 #define MINIDUMP_H
 
+#pragma pack(push, 1)
+
 typedef enum MDMP_DumpKind
 {
   MDMP_DumpKind_Normal                                     = 0x00000000,
@@ -226,4 +228,6 @@ struct MDMP_SystemInfo
   // CPU_INFORMATION Cpu; (architecture dependent)
 };
 
+#pragma pack(pop)
+
 #endif // MINIDUMP_H