decompiler: Creating an invalid JSON config file doesn't have an actionable error

[xTVaser]

When editing one of the several JSON files and you make a mistake, the decompiler will just hit an assertion failure. It would be better if it also logged the err from nholmann which i assume atleast references a line number.

[water111]

I have been getting at least some info on Linux, but its through an uncaught exception and maybe windows doesn't print this?

Either way, I added something in #463 to print an actual error like this:

[2021-05-11 21:37:24:733] [error] Error parsing JSON in file decompiler/config/jak1_ntsc_black_label/label_types.jsonc: [json.exception.parse_error.101] parse error at line 267, column 5: syntax error while parsing object key - unexpected '['; expected string literal

[xTVaser]

Yup, a lot better now!

[2021-05-12 20:09:02] [error] Error parsing JSON in file decompiler/config/jak1_ntsc_black_label/label_types.jsonc: [json.exception.parse_error.101] parse error at line 356, column 5: syntax error while parsing array - unexpected '['; expected ']'
task: Failed to run task "decomp-file": task: Failed to run task "decomp": exit status 3