Use `captureError()` for internal ERROR, WARNING and FATAL engine's messages

Starting this release the SDK collects all the internal ERROR, WARNING and FATAL (dmLogError(), dmLogWarning(), dmLogFatal()) engine's messages using PokiSDK.captureError(). These messages will be available in your dashboard in the following format: DEFOLD:message. For example:

DEFOLD:ERROR:GUI: Could not create the node since the buffer is full (32).

Do not collect Lua errors manually using sys.set_error_handler() anymore. It will be collected automatically, for example:

DEFOLD:ERROR:SCRIPT: example/poki-sdk.gui_script:32: attempt to perform arithmetic on global 'a' (a nil value)
stack traceback:
 example/poki-sdk.gui_script:32: in function <example/poki-sdk.gui_script:31>