TactilityC improvements for tt_app_ functions (#192)

- Renamed `tt_app_context_*` to tt_app_*`
- Renamed `AppContextHandle` to `AppHandle`
- Created `tt_app_start()` and `tt_app_start_with_bundle()`

TactilityC/Source/tt_init.cpp

@@ -2,9 +2,9 @@
 
 #include "elf_symbol.h"
 
-#include "tt_app_context.h"
-#include "tt_app_manifest.h"
+#include "tt_app.h"
 #include "tt_app_alertdialog.h"
+#include "tt_app_manifest.h"
 #include "tt_app_selectiondialog.h"
 #include "tt_bundle.h"
 #include "tt_hal_i2c.h"
@@ -23,9 +23,9 @@ extern "C" {
 const struct esp_elfsym elf_symbols[] {
     // Tactility
     ESP_ELFSYM_EXPORT(tt_app_register),
-    ESP_ELFSYM_EXPORT(tt_app_context_get_parameters),
-    ESP_ELFSYM_EXPORT(tt_app_context_set_result),
-    ESP_ELFSYM_EXPORT(tt_app_context_has_result),
+    ESP_ELFSYM_EXPORT(tt_app_get_parameters),
+    ESP_ELFSYM_EXPORT(tt_app_set_result),
+    ESP_ELFSYM_EXPORT(tt_app_has_result),
     ESP_ELFSYM_EXPORT(tt_app_selectiondialog_start),
     ESP_ELFSYM_EXPORT(tt_app_selectiondialog_get_result_index),
     ESP_ELFSYM_EXPORT(tt_app_alertdialog_start),