feat(ui): enable multiple keyboard layouts for "paste text" to remote host (#405)

* Enable multiple keyboard layouts for paste text from host

* Trema is the more robust method for capital umlauts

* Improve error handling and pre-loading

* Improve accent handling

* Remove obscure Alt-Gr keys, unsure if they are supported everywhere

* Add Swiss French

* Change line ordering

* Fix whitespace

* Add French (France)

* Add English (UK)

* Add Swedish

* Add Spanish

* Fix fr_FR special characters

* Add more keys to Spanish

* Remove default value shift: false

* Add Norwegian

* Operator precedence 🤦

* Add Italian

* Add Czech

* Move guard statements outside of loop

* Move language name definitions into the keyboard layout files

* Change the locale names to their native language

German->Deutsch et. al.

* Move hold key handling into Go backend analogous to https://www.kernel.org/doc/Documentation/usb/gadget_hid.txt

* Remove trailing whitespace

* Fix

* Add Belgisch Nederlands

* Add JSONRPC handling

* Use useSettingsStore

* Revert "Move hold key handling into Go backend analogous to https://www.kernel.org/doc/Documentation/usb/gadget_hid.txt"

This reverts commit 146cee9309ca7a8b7ab103e955f3fcc38a4bc692.

* Move FeatureFlag to navigation

* Fix: flip Y/Z

* Add useEffect dependencies

* Embolden language

* Add to useCallback dependencies

---------

Co-authored-by: Marc Brooks <IDisposable@gmail.com>

jsonrpc.go

@@ -901,6 +901,18 @@ func rpcSetCloudUrl(apiUrl string, appUrl string) error {
 	return nil
 }
 
+func rpcGetKeyboardLayout() (string, error) {
+	return config.KeyboardLayout, nil
+}
+
+func rpcSetKeyboardLayout(layout string) error {
+	config.KeyboardLayout = layout
+	if err := SaveConfig(); err != nil {
+		return fmt.Errorf("failed to save config: %w", err)
+	}
+	return nil
+}
+
 func getKeyboardMacros() (interface{}, error) {
 	macros := make([]KeyboardMacro, len(config.KeyboardMacros))
 	copy(macros, config.KeyboardMacros)
@@ -1066,6 +1078,8 @@ var rpcHandlers = map[string]RPCHandler{
 	"setUsbDevices":          {Func: rpcSetUsbDevices, Params: []string{"devices"}},
 	"setUsbDeviceState":      {Func: rpcSetUsbDeviceState, Params: []string{"device", "enabled"}},
 	"setCloudUrl":            {Func: rpcSetCloudUrl, Params: []string{"apiUrl", "appUrl"}},
+	"getKeyboardLayout":      {Func: rpcGetKeyboardLayout},
+	"setKeyboardLayout":      {Func: rpcSetKeyboardLayout, Params: []string{"layout"}},
 	"getKeyboardMacros":      {Func: getKeyboardMacros},
 	"setKeyboardMacros":      {Func: setKeyboardMacros, Params: []string{"params"}},
 }