Hide error traceback

[tm-a-t]

TGPy messages with errors look quite like random spam, and full error tracebacks are rarely useful.

I am proposing to show only the last line of the error and save the full error to a variable and/or logs.

Example

Current behavior:

msg.something

TGPy> Error occurred

Traceback (most recent call last):
  File "/home/tmat/.local/pipx/venvs/tgpy/lib/python3.11/site-packages/tgpy/_core/meval.py", line 175, in _meval
    new_locs, ret = await getattr(py_module, 'tmp')(**kwargs)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "tgpy://message/-1001611149679/38326", line 1, in tmp
    msg.something
AttributeError: 'Message' object has no attribute 'something'

Suggested behavior:

msg.something

TGPy> AttributeError: 'Message' object has no attribute 'something'

[vanutp]

Implemented in 739fbbc