set LV_ASSERT_HANDLER to something user friendly #14

the handler is invoked when assertions like LV_ASSERT_MALLOC(p) are triggered.

by default, the handler is set to:

#define LV_ASSERT_HANDLER_INCLUDE <stdint.h>
#define LV_ASSERT_HANDLER while(1)

which would freeze the ui and is not ideal. maybe set it to display an emergency screen with a shutdown button or something else.

note: if malloc assertion is triggered, it could be impossible to construct a new ui screen.

the handler is invoked when assertions like `LV_ASSERT_MALLOC(p)` are triggered. by default, the handler is set to: ```c #define LV_ASSERT_HANDLER_INCLUDE <stdint.h> #define LV_ASSERT_HANDLER while(1) ``` which would freeze the ui and is not ideal. maybe set it to display an emergency screen with a shutdown button or something else. note: if malloc assertion is triggered, it could be impossible to construct a new ui screen.

moved to https://github.com/nakamochi/ndg/issues/6

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set LV_ASSERT_HANDLER to something user friendly #14