Allow disabling anti-aliasing via a setting (#241)

## Summary

Fixes https://github.com/daveallie/crosspoint-reader/issues/233

## Additional Context

By disabling the Text Anti-Aliasing in the settings, you can get faster
black-and-white page turns that work exactly like the stock firmware,
instead of having an additional flash after rendering (see issue linked
above for example).

Tested on the X4 and confirmed working.

---------

Co-authored-by: Dave Allie <dave@daveallie.com>

src/CrossPointSettings.cpp

@@ -14,7 +14,7 @@ CrossPointSettings CrossPointSettings::instance;
 namespace {
 constexpr uint8_t SETTINGS_FILE_VERSION = 1;
 // Increment this when adding new persisted settings fields
-constexpr uint8_t SETTINGS_COUNT = 16;
+constexpr uint8_t SETTINGS_COUNT = 17;
 constexpr char SETTINGS_FILE[] = "/.crosspoint/settings.bin";
 }  // namespace
 
@@ -45,6 +45,7 @@ bool CrossPointSettings::saveToFile() const {
   serialization::writePod(outputFile, screenMargin);
   serialization::writePod(outputFile, sleepScreenCoverMode);
   serialization::writeString(outputFile, std::string(opdsServerUrl));
+  serialization::writePod(outputFile, textAntiAliasing);
   outputFile.close();
 
   Serial.printf("[%lu] [CPS] Settings saved to file\n", millis());
@@ -107,6 +108,8 @@ bool CrossPointSettings::loadFromFile() {
       strncpy(opdsServerUrl, urlStr.c_str(), sizeof(opdsServerUrl) - 1);
       opdsServerUrl[sizeof(opdsServerUrl) - 1] = '\0';
     }
+    serialization::readPod(inputFile, textAntiAliasing);
+    if (++settingsRead >= fileSettingsCount) break;
   } while (false);
 
   inputFile.close();