Remove dead code (#11082)

Removed:
- MessageStore::addFromPacket and addFromString, superseded by
  tryAddFromPacket
- GeoCoord rangeRadiansToMeters, distanceTo, bearingTo
- Router::rawSend, declared virtual with no override and no caller
- ContentHandler handleHotspot, handleFs, handleAdminSettings,
  handleAdminSettingsApply, handleDeleteFsContent and their commented
  route registrations, plus the now unreachable htmlDeleteDir and the
  handleUpdateFs declaration that had no definition
- ContentHelper replaceAll
- OnScreenKeyboardModule popup chain: showPopup, clearPopup, drawPopup,
  drawPopupOverlay and their state, unreachable since the frame based UI
  was replaced by baseUI
- DebugRenderer drawDebugInfoTrampoline, drawDebugInfoSettingsTrampoline
  and the orphaned drawFrameSettings
- NodeListRenderer calculateMaxScroll, drawColumns and a stale extern
  haveGlyphs declaration with no definition
- UIRenderer::haveGlyphs, Screen::blink,
  NotificationRenderer::showKeyboardMessagePopupWithTitle,
  VirtualKeyboard::getInputText
- InkHUD touchNavLeft, touchNavRight, Applet::getActiveNodeCount,
  ThreadedMessageApplet::saveMessagesToFlash
- TwoButton::setHandlerUp, TwoButtonExtended setHandlerUp,
  setJoystickDownHandlers, setJoystickUpHandlers
- CannedMessageModule LaunchRepeatDestination, isCharInputAllowed,
  hasMessages
- TrafficManagementModule resetStats, recordRouterHopPreserved,
  saturatingIncrement
- UnitConversions::MetersPerSecondToMilesPerHour
- EncryptedStorage getSessionRemainingSeconds
- BMI270Sensor::writeRegisters, GPS::hasFlow, FSCommon copyFile,
  SerialConsole consolePrintf, buzz playLongPressLeadUp,
  memGet displayPercentHeapFree

src/graphics/draw/UIRenderer.cpp

@@ -1386,30 +1386,6 @@ int UIRenderer::formatDateTime(char *buf, size_t bufSize, uint32_t rtc_sec, OLED
     return display->getStringWidth(buf);
 }
 
-// Check if the display can render a string (detect special chars; emoji)
-bool UIRenderer::haveGlyphs(const char *str)
-{
-#if defined(OLED_PL) || defined(OLED_UA) || defined(OLED_RU) || defined(OLED_CS)
-    // Don't want to make any assumptions about custom language support
-    return true;
-#endif
-
-    // Check each character with the lookup function for the OLED library
-    // We're not really meant to use this directly..
-    bool have = true;
-    for (uint16_t i = 0; i < strlen(str); i++) {
-        uint8_t result = Screen::customFontTableLookup((uint8_t)str[i]);
-        // If font doesn't support a character, it is substituted for ¿
-        if (result == 191 && (uint8_t)str[i] != 191) {
-            have = false;
-            break;
-        }
-    }
-
-    // LOG_DEBUG("haveGlyphs=%d", have);
-    return have;
-}
-
 #ifdef USE_EINK
 /// Used on eink displays while in deep sleep
 void UIRenderer::drawDeepSleepFrame(OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y)