#127 Use standard key combinations for copy/cut/paste of items and text

[Rob Swindell]

In some places (e.g. directory), it's F5 to copy , F6 to paste rather than Ctrl-C and Ctrl-V.

In other places (editing strings), it's Shift-DEL to Cut (rather than or in addition to Ctrl-X). And Ctrl-V to paste works when editing strings, so this is inconsistent.

In my opinion, letting Ctrl-C/X/V work for these functions (and use them in the status bar help) even when UIFC_NOCTRL api mode is set, would be the best solution.