C++ apps: templated scene controller (#517)

* C++ apps: templated scene controller
* templated app: fix type names
* templated app: text store component
* Applications: add "Templated Scene" application
* templated app: refractoring
* Gui module byte input: fix docs
* templated app: new byte input scene
* templated app: dialog ex view module
* templated app: popup view module
* templated app: dialog-ex view module, fix docs
* templated app: text input view module
* Gui module text input: fix docs
* Furi: duplicated include
* templated app: record holder (controller) class
* templated app: view modules can now be accessed via cast
* templated app: remove unused includes
* templated app: fix return code

lib/app-scened-template/text-store.cpp

@@ -0,0 +1,18 @@
+#include "text-store.h"
+#include <furi.h>
+
+TextStore::TextStore(uint8_t _text_size)
+    : text_size(_text_size) {
+    text = static_cast<char*>(malloc(text_size + 1));
+}
+
+TextStore::~TextStore() {
+    free(text);
+}
+
+void TextStore::set_text_store(const char* _text...) {
+    va_list args;
+    va_start(args, _text);
+    vsnprintf(text, text_size, _text, args);
+    va_end(args);
+}