* [Companion] I18N:
* Introduce new Translations class to centralize all related functionality;
* Add ability to search multiple locations for .qm translation binaries (local folders, resources, system paths);
* Add ability to reload translations dynamically w/out application restart;
* Improve support for loading Qt translations (if available);
* [build][i18n] Look for and include pre-built Qt translations with other translation resources; Generate translations.qrc dynamically with rest of build files; Add EN "translation" file (simpler UI string edits and possible abstractions); Rename ZH translation file to be country-specific.
* [build] Centralize finding all the Qt bits into root CMakeLists; Make sure QT_QMAKE_EXECUTABLE is defined; Disable dysfunctional simulator installer script generation.
* Cosmetics (unused includes).
* [Companion] Make language options menu dynamic based on available translations, and always show native language name; Allow changing language of some elements w/out restarting (esp. menus/toolbar buttons); Simplify menus/actions/handlers for themes and icon sizes.
* [build] Better way to generate translations.qrc using input file again (previous method was generating new qrc for each reconfig); Make sure common library is linked to other modules which may need it; Remove unused script.
