Support multiple temperature sensors

web/temperature_foot.html

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+    </div>
+    <hr/>
+    <div class="row form-group">
+        <div class="col-6">
+            <a href="/" class="btn btn-outline-secondary">Back</a>
+        </div>
+        <div class="col-6 text-right">
+            <button class="btn btn-primary">Save</button>
+        </div>
+    </div>
+</form>    

web/temperature_head.html

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+<form method="post" action="/save">
+    <input type="hidden" name="tempConfig" value="true"/>
+    <div class="my-3 p-3 bg-white rounded shadow">

web/temperature_row.html

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+<input type="hidden" name="sensor${index}" value="${address}"/>
+<div class="row mb-3">
+    <div class="col-xl-3 col-lg-4 col-sm-6">
+        <div class="input-group input-group-sm">
+            <div class="input-group-prepend">
+                <span class="input-group-text">Address</span>
+            </div>
+            <input name="sensor${index}address" type="text" class="form-control" value="${address}" maxlength="16" disabled/>
+        </div>
+    </div>
+    <div class="col-xl-4 col-lg-3 col-sm-6">
+        <div class="input-group input-group-sm">
+            <div class="input-group-prepend">
+                <span class="input-group-text">Name</span>
+            </div>
+            <input name="sensor${index}name" type="text" class="form-control" value="${name}" maxlength="32"/>
+        </div>
+    </div>
+    <div class="col-xl-3 col-lg-3 col-sm-6">
+        <div class="form-check">
+            <input name="sensor${index}common" class="form-check-input" type="checkbox" value="true" id="sensor${index}common" ${common}>
+            <label class="form-check-label" for="sensor${index}common">Include in average</label>
+          </div>
+    </div>
+    <div class="col-xl-2 col-lg-2 col-sm-6">
+        ${value} °C
+    </div>
+</div>