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Some terminal emulators, such as PuTTY or the macOS terminal, don't have full VT100 ACS support. For this reason, the RTS2 monitor borders and lines are not rendered properly.
Using the desired characters instead of ACS, we can render the monitor consistently for every terminal.

Here are some examples of the current monitor behaviour:
PuTTY:
macOS:

This is particularly confusing when editing a value or looking for something.

This is the behaviour using this patch:
PuTTY:
macOS:
