Temperature threshold updates

Sync temperature stuff with the new expected values - the old ones were too damn high. Also adds "°C" to clarify the (estimated) units of measurement.
Since the values are planned to be configurable in a later update and should be pulled from settingsTable when they are, these temperature values are just the current defaults.

guiwindow.cpp

@@ -2060,12 +2060,12 @@ void guiWindow::serialPort_readyRead()
                 testLabel[button-1]->setText(valuesNameList[button]);
             } else if(idleBuffer.contains("Temperature:")) {
                 uint8_t temp = idleBuffer.trimmed().right(2).toInt();
-                if(temp > 70) {
-                    testLabel[14]->setText(QString("<font color=#FF0000>Temp: %1</font>").arg(temp));
-                } else if(temp > 60) {
-                    testLabel[14]->setText(QString("<font color=#EABD2B>Temp: %1</font>").arg(temp));
+                if(temp > tempShutoff) {
+                    testLabel[14]->setText(QString("<font color=#FF0000>Temp: %1°C</font>").arg(temp));
+                } else if(temp > tempWarning) {
+                    testLabel[14]->setText(QString("<font color=#EABD2B>Temp: %1°C</font>").arg(temp));
                 } else {
-                    testLabel[14]->setText(QString("<font color=#11D00A>Temp: %1</font>").arg(temp));
+                    testLabel[14]->setText(QString("<font color=#11D00A>Temp: %1°C</font>").arg(temp));
                 }
             } else if(idleBuffer.contains("Analog:")) {
                 uint8_t analogDir = idleBuffer.trimmed().right(1).toInt();

guiwindow.h

@@ -210,6 +210,10 @@ private slots:
     // Table of tunables, as loaded from gun firmware
     uint32_t settingsTable_orig[settingsTypesCount];
 
+    // TODO: add this to settingsTable (5.1?)
+    uint8_t tempWarning = 35;
+    uint8_t tempShutoff = 42;
+
     // because pinBoxes' "->currentIndex" gets updated AFTER calling its activation signal,
     // we need to save its last index to properly compare and prevent duplicate changes,
     // and then update it at the end of the activate signal.