Add text-only prompt element for console-ui

[quintesse]

Fixes #1136

First stab at implementing this new text-only element. It won't win any beauty contests, but it works. WDYT @mattirn ?

NB: I considered creating a TextPrompt and using ConsoleUIItemIF for the lines of the Text element, but between the fact that TextPrompt would be mostly empty (because we're not actually asking for input) , the fact that items only deal with Strings, not AttributedStrings and the fact that each XxxxPrompt only displays a single line of result it just wasn't a good fit.

[mattirn]

Looks good!
I'd like to make two small changes:

1. from the resultMap that is returned from ConsolePrompt.prompt(...) method I would remove textPrompt results (i.e. _text_X=NoResult{})
2. in BasicDynamic example catch UserInterruptException in place of IOError, fixed in Move catch to proper place #1133.

I think we can open an other ticket/pull request for ConsolePrompt's methods visibility changes

[quintesse]

1. from the resultMap that is returned from ConsolePrompt.prompt(...) method I would remove textPrompt results (i.e. _text_X=NoResult{})

Good idea!

2. in BasicDynamic example catch UserInterruptException in place of IOError, fixed in Move catch to proper place #1133.

I actually tried that and couldn't get it to work right. Let me try again and if I can't figure it out I'll give a shout for help :-)

I think we can open an other ticket/pull request for ConsolePrompt's methods visibility changes

Ok, btw, do you perhaps see a way to "retrofit" the now deprecated methods so they can be used with this new prompt method? I've been racking my brain but I can't think of a good solution. Sure, we can add them with a different name, eg promptItems() or whatever, but it seems a pity. It probably also depends on how much backwards compatibility you want to maintain with older code.

[mattirn]

1. from the resultMap that is returned from ConsolePrompt.prompt(...) method I would remove textPrompt results (i.e. _text_X=NoResult{})

Good idea!

textPrompt results should be removed also here
return resultMap;

2. in BasicDynamic example catch UserInterruptException in place of IOError, fixed in Move catch to proper place #1133.

I actually tried that and couldn't get it to work right. Let me try again and if I can't figure it out I'll give a shout for help :-)

Update your project. I have merged the fix #1133.

I think we can open an other ticket/pull request for ConsolePrompt's methods visibility changes

Ok, btw, do you perhaps see a way to "retrofit" the now deprecated methods so they can be used with this new prompt method?

I have created the ticket #1141 with some guide lines...

[quintesse]

@mattirn updated the PR with your suggestions