Various improvements (#461)

* **New Features**
  * Time and delay utilities added (ticks, ms, µs); SD card now uses an expansion-header CS pin; HTTP downloads warn when run on the GUI task and yield to avoid blocking.

* **Bug Fixes / Reliability**
  * Many hard-crash paths converted to guarded checks to reduce abrupt termination and improve stability.

* **Tests**
  * Unit tests added to validate time and delay accuracy.

* **Chores**
  * License header and build/macro updates.

Tactility/Source/hal/gps/GpsInit.cpp

@@ -139,7 +139,7 @@ GpsResponse getACKCas(uart::Uart& uart, uint8_t class_id, uint8_t msg_id, uint32
 bool init(uart::Uart& uart, GpsModel type) {
     switch (type) {
         case GpsModel::Unknown:
-            tt_crash();
+            check(false);
         case GpsModel::AG3335:
         case GpsModel::AG3352:
             return initAg33xx(uart);