fix(windows): add apply actions call to core_event

[rc-swag]

The problem was actually the fact that the memset(const_cast<km_core_actions*>(&_action_struct), 0, sizeof(km_core_actions)); call in state.cpp initialisation means the object is zeroed out and results in new_caps_lock_state == KM_CORE_CAPS_OFF. This bug would have been a regresion from when we use to have an actions list. Calling apply_actions_and_merge_app_context which then calls
action_item_list_to_actions_object the top of this function sets all the actions default values.
So in this case calling it means the _action_struct is correctly initialised, event though no actions were added.

I think we should consider making a helper km::core::set_action_defaults which is called on contstruction just after the memset zeroing.

add apply_actions_and_merge_app_context to km_core_event parent. This ensures any actions as result of the km_core_event are applied and actions object updated.

Fixes:#15857

User Testing

TEST_CAPS_STAYS_ON

Use the capslock.kmp.zip keyboard.
Starting an app Word or Notepad, Keyman is running but a Non-Keyman keyboard is selected.

Press the CapsLock key verify the Caplock indicator light is on.

Select the Keyboard named Capslock without pressing any other key.
Ensuring the app still has focus verify the CapsLock Indicator remains on.

Repeat to ensure it continues to behave as expected not turning of the indicator when selecting the Capslock Keyman keyboard. Or any keyboard that doesn't have capsallwaysoff store.

TEST_CAPS_ALWAYS_OFF

Use a keyboard with the caps_always_off.kmp.zip store set
Install Caps Always Off keyboard.

Starting an app Word or Notepad, Keyman is running but a Non-Keyman keyboard is selected.

Select the Keyboard named Caps Always Off without pressing any other key.
Ensuring the app still has focus verify the CapsLock Indicator turns OFF.

Repeat to ensure it continues to behave as expected, turning of the indicator off when selecting the Caps Always off Keyman keyboard.

[keymanapp-test-bot]

User Test Results

Test specification and instructions

• ⬜ TEST_CAPS_STAYS_ON (OPEN)
• ⬜ TEST_CAPS_ALWAYS_OFF (OPEN)

Results Template

# Test Results

* **TEST_CAPS_STAYS_ON (OPEN):** notes
* **TEST_CAPS_ALWAYS_OFF (OPEN):** notes

Test Artifacts

• macOS
  • Keyman for macOS
  • Keyman for macOS (old PRs)
• Windows
  • Keyman for Windows
  • FirstVoices Keyboards for Windows
  • FirstVoices Keyboards for Windows (old PRs)
  • Keyman for Windows (old PRs)
  • Text Editor (ARM64)
  • Text Editor (x64)
  • Text Editor (x86)

[rc-swag]

I have added call to the constructor because I believe construction should have the correct state.
see second commit