Improvements for Files app and statusbar icon (#35)

- Created `tt_get_platform()` to use with more complex platform checks aside from the `ESP_PLATFORM` preprocessor directive
- Expand PC/sim memory to 256k so we can load the max amount of entries in Files without memory issues. I decided to skip the LVGL buffer entirely so it's easier to catch memory leaks.
- Simplified logic in `files_data.c`
- Implement statusbar as a proper widget
- Implement statusbar widget for wifi service
- Implement statusbar widget for sdcard mounting/unmounting

tactility-core/src/kernel.c

@@ -194,3 +194,11 @@ void tt_delay_us(uint32_t microseconds) {
     usleep(microseconds);
 #endif
 }
+
+Platform tt_get_platform() {
+#ifdef ESP_PLATFORM
+    return PLATFORM_ESP;
+#else
+    return PLATFORM_PC;
+#endif
+}

tactility-core/src/kernel.h

@@ -6,6 +6,11 @@
 extern "C" {
 #endif
 
+typedef enum {
+    PLATFORM_ESP,
+    PLATFORM_PC
+} Platform;
+
 /** Check if CPU is in IRQ or kernel running and IRQ is masked
  * 
  * Originally this primitive was born as a workaround for FreeRTOS kernel primitives shenanigans with PRIMASK.
@@ -109,6 +114,8 @@ void tt_delay_ms(uint32_t milliseconds);
  */
 void tt_delay_us(uint32_t microseconds);
 
+Platform tt_get_platform();
+
 #ifdef __cplusplus
 }
 #endif