Global: make FFinstance instance a global variable

As discussed in https://github.com/fastfetch-cli/fastfetch/discussions/473

src/detection/battery/battery.h

@@ -17,6 +17,6 @@ typedef struct BatteryResult
     double temperature;
 } BatteryResult;
 
-const char* ffDetectBattery(FFinstance* instance, FFBatteryOptions* options, FFlist* results);
+const char* ffDetectBattery(FFBatteryOptions* options, FFlist* results);
 
 #endif

src/detection/battery/battery_android.c

@@ -7,7 +7,7 @@
 #define FF_TERMUX_API_PATH FASTFETCH_TARGET_DIR_ROOT "/libexec/termux-api"
 #define FF_TERMUX_API_PARAM "BatteryStatus"
 
-const char* ffDetectBattery(FF_MAYBE_UNUSED FFinstance* instance, FFBatteryOptions* options, FFlist* results)
+const char* ffDetectBattery(FFBatteryOptions* options, FFlist* results)
 {
     FF_STRBUF_AUTO_DESTROY buffer = ffStrbufCreate();
 

src/detection/battery/battery_apple.c

@@ -5,7 +5,7 @@
 
 #include <IOKit/IOKitLib.h>
 
-static double detectBatteryTemp()
+static double detectBatteryTemp(void)
 {
     FF_LIST_AUTO_DESTROY temps = ffListCreate(sizeof(FFTempValue));
 
@@ -27,7 +27,7 @@ static double detectBatteryTemp()
     return result;
 }
 
-const char* ffDetectBattery(FF_MAYBE_UNUSED FFinstance* instance, FFBatteryOptions* options, FFlist* results)
+const char* ffDetectBattery(FFBatteryOptions* options, FFlist* results)
 {
     CFMutableDictionaryRef matchDict = IOServiceMatching("AppleSmartBattery");
     if (matchDict == NULL)

src/detection/battery/battery_bsd.c

@@ -7,7 +7,7 @@
 #include <sys/fcntl.h>
 #include <unistd.h>
 
-const char* ffDetectBattery(FF_MAYBE_UNUSED FFinstance* instance, FF_MAYBE_UNUSED FFBatteryOptions* options, FFlist* results)
+const char* ffDetectBattery(FF_MAYBE_UNUSED FFBatteryOptions* options, FFlist* results)
 {
     //https://www.freebsd.org/cgi/man.cgi?acpi_battery(4)
     //https://gitlab.xfce.org/panel-plugins/xfce4-battery-plugin/-/blob/master/panel-plugin/libacpi.c

src/detection/battery/battery_linux.c

@@ -68,7 +68,7 @@ static void parseBattery(FFstrbuf* dir, FFlist* results)
     result->temperature = FF_BATTERY_TEMP_UNSET;
 }
 
-const char* ffDetectBattery(FF_MAYBE_UNUSED FFinstance* instance, FFBatteryOptions* options, FFlist* results)
+const char* ffDetectBattery(FFBatteryOptions* options, FFlist* results)
 {
     FF_STRBUF_AUTO_DESTROY baseDir = ffStrbufCreateA(64);
 

src/detection/battery/battery_nosupport.c

@@ -1,8 +1,8 @@
 #include "fastfetch.h"
 #include "battery.h"
 
-const char* ffDetectBattery(FFinstance* instance, FFBatteryOptions* options, FFlist* results)
+const char* ffDetectBattery(FFBatteryOptions* options, FFlist* results)
 {
-    FF_UNUSED(instance, options, results)
+    FF_UNUSED(options, results)
     return "Not supported on this platform";
 }

src/detection/battery/battery_windows.c

@@ -30,9 +30,9 @@ static inline void wrapSetupDiDestroyDeviceInfoList(HDEVINFO* hdev)
         SetupDiDestroyDeviceInfoList(*hdev);
 }
 
-const char* ffDetectBattery(FFinstance* instance, FFBatteryOptions* options, FFlist* results)
+const char* ffDetectBattery(FFBatteryOptions* options, FFlist* results)
 {
-    if(instance->config.allowSlowOperations)
+    if(instance.config.allowSlowOperations)
     {
         //https://learn.microsoft.com/en-us/windows/win32/power/enumerating-battery-devices
         HDEVINFO hdev __attribute__((__cleanup__(wrapSetupDiDestroyDeviceInfoList))) =