Handle clang 10 warnings:

+ fix -Wtautological-bitwise-compare
+ fix -Wimplicit-int-float-conversion
+ fix -Wmisleading-indentation
+ fix -Wrange-loop-construct
+ suppress -Wdeprecated-copy of 3rd party libs

src/Mod/Sketcher/App/planegcs/GCS.cpp

@@ -25,6 +25,12 @@
 #pragma warning(disable : 4996)
 #endif
 
+#if defined(__clang__) && defined(__has_warning)
+#if __has_warning("-Wdeprecated-copy")
+# pragma clang diagnostic ignored "-Wdeprecated-copy"
+#endif
+#endif
+
 //#define _GCS_DEBUG
 //#define _GCS_DEBUG_SOLVER_JACOBIAN_QR_DECOMPOSITION_TRIANGULAR_MATRIX
 //#define _DEBUG_TO_FILE // Many matrices surpass the report view string size.