Fix bug and update external app sdk versions (#324)

- Fix bug in Development app: when launching/stopping external app due to LVGL being stopped and a timer still being active (sometimes, as it's a race condition)
- Added TODO to fix the same bug in other apps
- Update external app SDKs to `0.5.0-SNAPSHOT`

Documentation/ideas.md

@@ -16,6 +16,7 @@
 - Create an "app install paths" settings app to add/remove paths.
   Scan these paths on startup.
   Make the AppList use the scan results.
+- Apps with update timer should check `lvgl::isStarted()`
  
 ## Medium Priority
 

ExternalApps/Calculator/tactility.properties

@@ -1,2 +1,2 @@
 [sdk]
-version = 0.4.0
+version = 0.5.0-SNAPSHOT

ExternalApps/GraphicsDemo/tactility.properties

@@ -1,2 +1,2 @@
 [sdk]
-version = 0.4.0
+version = 0.5.0-SNAPSHOT

ExternalApps/HelloWorld/tactility.properties

@@ -1,2 +1,2 @@
 [sdk]
-version = 0.4.0
+version = 0.5.0-SNAPSHOT

Tactility/Source/app/development/Development.cpp

@@ -1,5 +1,7 @@
 #ifdef ESP_PLATFORM
 
+#include "Tactility/lvgl/Lvgl.h"
+
 #include <Tactility/Tactility.h>
 
 #include <Tactility/app/AppManifest.h>
@@ -28,7 +30,7 @@ class DevelopmentApp final : public App {
 
     Timer timer = Timer(Timer::Type::Periodic, [this] {
         auto lock = lvgl::getSyncLock()->asScopedLock();
-        if (lock.lock(lvgl::defaultLockTime)) {
+        if (lock.lock(lvgl::defaultLockTime) && lvgl::isStarted()) {
             updateViewState();
         }
     });