Turn on a bunch of warnings

Turn on as many warnings as easily possible from:
https://github.com/lefticus/cppbestpractices/blob/e73393f25a85f83fed7399d8b65cb117d00b2231/02-Use_the_Tools_Available.md#L100

Tested:
ipmitool sensor list still works

Change-Id: Ied8fa66de9fcd25e448f8048c4f8216b426b6f55
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/src/HwmonTempSensor.cpp b/src/HwmonTempSensor.cpp
index 09161e4..16742ce 100644
--- a/src/HwmonTempSensor.cpp
+++ b/src/HwmonTempSensor.cpp
@@ -103,7 +103,7 @@
         {
             float nvalue = std::stof(response);
             nvalue /= sensorScaleFactor;
-            if (nvalue != value)
+            if (static_cast<double>(nvalue) != value)
             {
                 updateValue(nvalue);
             }