Fix parsing complex symbols (#1050)

[ntsleep]

A quick attempt to fix #1050. It requires more testing with different commands.

[disconnect3d]

Yeah... so as we can see in the tests failing, while this fixes the issue with parsing complex symbols, it unfortunately breaks the case when we just want to pass in a space in quotes as an argument.

FWIW I have asked on GDB irc channel about this behavior vs the expected GDB behavior on parsing commands (because oh well, the print or examine commands in GDB parses those complex symbols properly when quotations are there) and I got no reply yet. I will try to ping the corresping people there.

Btw @ntsleep we should add a testcase for this behavior first and work on a solution that does not break other tests.

Though, I am not sure what that solution would be yet... I think we should maybe try to debug the GDB's print/examine commands and the way they parse input and see if that would give us a hint.

[disconnect3d]

This seems invalid/not an issue. See #1050.