Helper function to aid developing and testing codes
| 1 | developing(file, code, time = 1, catch_error = T)
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| file | character string; the filepath. | 
| code | character string; the code to be run when a change is made to file. | 
| time | numeric; monitoring change of file every "time" seconds. | 
| catch_error | boolean; whether to print out error. | 
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