Initialize WMI only once, remove init calls from everywhere it is called and initialize it once as a static variable

* See comment: https://gitlab.com/CalcProgrammer1/OpenRGB/-/issues/1581#note_684260496

Controllers/AsusTUFLaptopController/AsusTUFLaptopWMIDetect.cpp

@@ -16,7 +16,6 @@ static void DetectAsusTUFLaptopWMIControllers(std::vector<RGBController*>&)
     // For now, checking for "TUF Gaming" should suffice
 
     Wmi wmi;
-    wmi.init();
 
     std::vector<QueryObj> systemProduct;
     if (wmi.query("SELECT * FROM Win32_ComputerSystemProduct", systemProduct))

dependencies/dmiinfo.cpp

@@ -27,7 +27,6 @@ DMIInfo::DMIInfo()
     manufacturer    = "";
     HRESULT hres;
     Wmi wmi;
-    wmi.init();
 
     // Query WMI for Win32_PnPSignedDriver entries with names matching "SMBUS" or "SM BUS"
     // These devices may be browsed under Device Manager -> System Devices

i2c_smbus/i2c_smbus_i801.cpp

@@ -498,7 +498,6 @@ void i2c_smbus_i801_detect()
     i2c_smbus_interface * bus;
     HRESULT hres;
     Wmi wmi;
-    wmi.init();
 
     // Query WMI for Win32_PnPSignedDriver entries with names matching "SMBUS" or "SM BUS"
     // These devices may be browsed under Device Manager -> System Devices

i2c_smbus/i2c_smbus_piix4.cpp

@@ -192,7 +192,6 @@ void i2c_smbus_piix4_detect()
     i2c_smbus_interface * bus;
     HRESULT hres;
     Wmi wmi;
-    wmi.init();
 
     // Query WMI for Win32_PnPSignedDriver entries with names matching "SMBUS" or "SM BUS"
     // These devices may be browsed under Device Manager -> System Devices

wmi/wmi.cpp

@@ -2,6 +2,7 @@
 
 IWbemLocator* Wmi::pLoc = nullptr;
 IWbemServices* Wmi::pSvc = nullptr;
+HRESULT WmiInit = Wmi::init();
 
 // Taken from https://stackoverflow.com/questions/215963/
 // Convert a wide Unicode string to an UTF8 string

wmi/wmi.h

@@ -26,7 +26,7 @@ public:
     ~Wmi();
 
     // Initialises connection to WMI host
-    HRESULT init();
+    static HRESULT init();
 
     HRESULT query(std::string queryStr,
                   std::vector<QueryObj>& queryVectorOut,