Add Remote App & UI updates. (#1451)

* Alpha order sub-menus
* WIP Getting Remote types outlined
* WIP building UI
* WIP adding RemoteButton control
* WIP Fix build
* WIP Basic editing support
* Border on the active button
* Make TxView2 sane
* Add easier RGB color creation from uint32
* Center some button icons
* WIP Remote - main UI
* WIP main UI mostly working, can send
* Add 'join' utility
* WIP save/load
* Pre-alloc buttons to prevent focus dangling
* Alpha order settings/debug pages
* Add UI for picking capture and set frequency
* WIP Getting really close now
* Fix path for init name
* Some fit & finish

firmware/common/utility.hpp

@@ -27,7 +27,9 @@
 #include <complex>
 #include <cstdint>
 #include <cstddef>
+#include <initializer_list>
 #include <memory>
+#include <string_view>
 #include <type_traits>
 
 #define LOCATE_IN_RAM __attribute__((section(".ramtext")))
@@ -213,4 +215,6 @@ struct range_t {
     }
 };
 
+std::string join(char c, std::initializer_list<std::string_view> strings);
+
 #endif /*__UTILITY_H__*/