Thread, Timer and flash.sh improvements (#165)

- Various improvements to Thread and Timer:
  - Remove "mark as static" option as it is unused
  - Implemented core pinning for ESP32 platforms
  - Use `TickType_t` consistently (instead of `uint32_t`)
  - Use `enum class` instead of `enum`
- Fix for `flash.sh` not working when using `pip` to install `esptool`

TactilityC/Source/tt_timer.cpp

@@ -58,8 +58,8 @@ bool tt_timer_set_pending_callback(TimerHandle handle, TimerPendingCallback call
     );
 }
 
-void tt_timer_set_thread_priority(TimerHandle handle, TimerThreadPriority priority) {
-    ((TimerWrapper*)handle)->timer->setThreadPriority((tt::Timer::ThreadPriority)priority);
+void tt_timer_set_thread_priority(TimerHandle handle, ThreadPriority priority) {
+    ((TimerWrapper*)handle)->timer->setThreadPriority((tt::Thread::Priority)priority);
 }
 
 }