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.cpp

@@ -213,3 +213,25 @@ static constexpr uint32_t gcd_top(const uint32_t u, const uint32_t v) {
 uint32_t gcd(const uint32_t u, const uint32_t v) {
     return gcd_top(u, v);
 }
+
+std::string join(char c, std::initializer_list<std::string_view> strings) {
+    std::string result;
+    size_t total_size = strings.size();
+
+    for (auto s : strings)
+        total_size += s.size();
+
+    result.reserve(total_size);
+    bool first = true;
+
+    for (auto s : strings) {
+        if (!first)
+            result += c;
+        else
+            first = false;
+
+        result += s;
+    }
+
+    return result;
+}