Add usage text when missing options

[mbkupfer]

Is your feature request related to a problem? Please describe.
Using onedrive with no options returns a nicely formatted usage text:

$ onedrive

--synchronize or --monitor missing from your command options or use --help for further assistance

No OneDrive sync will be performed without either of these two arguments being present

But, this isn't the case for some other inputs. For example, using --single-directory or --get-O365-drive-id without a value will provide a "missing value" error, but this is then followed by a long and unhelpful dump of code.

Describe the solution you'd like
Strip all code from the error message and just leave it at Missing value for argument <argument-name>.

Describe alternatives you've considered
N/A

Additional context

You can reproduce this using the following commands:
$ onedrive --get-O365-drive-id
$ onedrive --synchronize --single-directory

Output:

object.Exception@/home/mkupfer/dlang/dmd-2.083.1/linux/bin64/../../src/phobos/std/getopt.d(883): Missing value for argument --single-directory.
----------------
<very long dump of unreadable code below>

[abraunegg]

Same issue exists for:

--confdir

and potentially all other config options that require user 'input'

[abraunegg]

@mbkupfer
Can you please help test PR #299 to resolve this issue:

git clone https://github.com/abraunegg/onedrive.git
cd onedrive
git fetch origin pull/299/head:pr299
git checkout pr299
make
make install

[mbkupfer]

Works for me.

[abraunegg]

PR #299 merged, closing as resolved

[lock]

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