Add TMS API for handling events directly; handle text input events

[griffi-gh]

• Introduce new raw event handler api
  raw event handlers get called before any internal widget/pscreen logic
  suitable for implementing stuff like immediate-mode ui backends

  typedef int (*tms_event_handler)(struct tms_event*);
  int tms_event_register_raw(tms_event_handler);
  

• Intercept and handle text input events

[rollerozxa]

   /home/runner/work/principia/principia/build-android/jni/tms/backends/android/main.c:232:17: error: expected expression
              std::copy(ev.text.text, ev.text.text + 32, spec.data.text.text);
                  ^
  1 error generated.
  make: *** [/usr/local/lib/android/sdk/ndk/23.2.8568313/build/core/build-binary.mk:476: /home/runner/work/principia/principia/build-android/principia/build/intermediates/cxx/Release/2c5a484w/obj/local/arm64-v8a/objs/main/tms/backends/android/main.o] Error 1

Probably gets fixed if you rename the android backend to .cc so it gets compiled as C++

[griffi-gh]

I'll just use good ol' memcpy instead

[rollerozxa]

Is this okay to be merged now?

[griffi-gh]

Is this okay to be merged now?

yeah, should be ok

[rollerozxa]

wham