Don't handle control and alt commands in terminal.

[jrincayc]

These need to be handled by wxMenuBar.

Closes #172

[jrincayc]

For what it is worth, ChatGPT suggested using event.Skip() and otherwise assisted in this.

[jrincayc]

I am kind of wondering if there are any times when things with Control or Alt are pressed that should be handled by wxTerminal::OnChar
(there is the following code:

    if (event.ControlDown()) keyCode &= 0237;
    if (event.AltDown()) keyCode += 0200;

that is trying to handle those keys.)

[jrincayc]

Ctrl-M is no-longer gives a return. Ctrl-C and Ctrl-V do copy and paste.

@brianharvey I am trying to decided if I am blocking any input that should still be handled in the text editor with this pull request (Ctrl-M seems to be the only one that this blocks). Thanks

[jrincayc]

Double checked.