logs: replace every fmt::print with a lg call instead (#1368)

Favors the `lg` namespace over `fmt` directly, as this will output the
logs to a file / has log levels.

I also made assertion errors go to a file, this unfortunately means
importing `lg` and hence `fmt` which was attempted to be avoided before.
But I'm not sure how else to do this aspect without re-inventing the
file logging.

We have a lot of commented out prints as well that we should probably
cleanup at some point / switch them to trace level and default to `info`
level.

I noticed the pattern of disabling debug logs behind some boolean,
something to consider cleaning up in the future -- if our logs were more
structured (knowing where they are coming from) then a lot this
boilerplate could be eliminated.

Closes #1358

game/graphics/texture/TexturePool.cpp

@@ -136,11 +136,9 @@ void TexturePool::unload_texture(PcTextureId tex_id, u64 gpu_id) {
     ASSERT(false);
     return;
   }
-  if (tex->is_placeholder) {
-    fmt::print("trying to unload something that was already placholdered: {} {}\n",
-               get_debug_texture_name(tex_id), tex->gpu_textures.size());
-  }
-  ASSERT(!tex->is_placeholder);
+  ASSERT_MSG(!tex->is_placeholder,
+             fmt::format("trying to unload something that was already placholdered: {} {}\n",
+                         get_debug_texture_name(tex_id), tex->gpu_textures.size()));
   auto it = std::find_if(tex->gpu_textures.begin(), tex->gpu_textures.end(),
                          [&](const auto& a) { return a.gl == gpu_id; });
   ASSERT(it != tex->gpu_textures.end());
@@ -378,4 +376,4 @@ std::string TexturePool::get_debug_texture_name(PcTextureId id) {
   } else {
     return "???";
   }
-}
+}