Implement save of key mappings

[FranzPoize]

• [ ] Find info about default config directory for apps (like appdata for windows and .config for linux)
• [ ] Save mapping to folder
• [ ] load mapping from config folder if it exists load default otherwise

Windows: https://learn.microsoft.com/en-us/windows/win32/shell/knownfolderid https://learn.microsoft.com/en-us/windows/win32/api/shlobj_core/nf-shlobj_core-shgetknownfolderpath?redirectedfrom=MSDN Linux: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

Library: https://github.com/sago007/PlatformFolders