Onscreen IDE & dynamic instant update [_v0.5.4_]

UPDATE :
[X] if the last edited main module file doesn’t exist, a warning will be displayed at startup screen and the open last edited files button will be disabled.
[X] if some other files don’t exist, the retry open window will be displayed instead of silently left unloaded.
[X] the realtime clock in the test scene is not activated during loading to avoid waking up scheduled stuff too early. This fixes weird errors if you use render frame call or framework step during loading, so the loading time is longer than those stuff’s time schedule, especially if you’re not using model cache.
[X] fixed code description RTT for GPU which only able to create ParasiteBuffer, done by laying out more cards and cameras.
[X] the code description text is much clearer now.

This is on Linux, which I only get ParasiteBuffer :