[Base] Add user-literals for several memory sizes

Rather than using `n * 1024 * 1024`, this adds a convenient `_MiB`/`_KiB` user-literal to the new `literals.h` header to concisely describe units of memory in a much more readable way. Any other useful literals can be added to this header. These literals exist in the `xe::literals` namespace so they are opt-in, similar to `std::chrono` literals, and require a `using namespace xe::literals` statement to utilize it within the current scope.

I've done a pass through the codebase to replace trivial instances of `1024 * 1024 * ...` expressions being used but avoided anything that added additional casting complexity from `size_t` to `uint32_t` and such to keep this commit concise.

src/xenia/base/logging.cc

@@ -25,6 +25,7 @@
 #include "xenia/base/cvar.h"
 #include "xenia/base/debugging.h"
 #include "xenia/base/filesystem.h"
+#include "xenia/base/literals.h"
 #include "xenia/base/math.h"
 #include "xenia/base/memory.h"
 #include "xenia/base/platform.h"
@@ -59,6 +60,7 @@ DEFINE_int32(
     "Logging");
 
 namespace dp = disruptorplus;
+using namespace xe::literals;
 
 namespace xe {
 
@@ -74,7 +76,7 @@ struct LogLine {
   char prefix_char;
 };
 
-thread_local char thread_log_buffer_[64 * 1024];
+thread_local char thread_log_buffer_[64_KiB];
 
 FileLogSink::~FileLogSink() {
   if (file_) {
@@ -234,7 +236,7 @@ class Logger {
   }
 
  private:
-  static const size_t kBufferSize = 8 * 1024 * 1024;
+  static const size_t kBufferSize = 8_MiB;
   uint8_t buffer_[kBufferSize];
 
   static const size_t kBlockSize = 256;