String handling in TcMenu

[vzahradnik]

Is your feature request related to a problem? Please describe.
We have several issues related to longer strings in TcMenu. These will be covered in this issue.

• Handle strings which don't fit the screen. For example if there is a field and a unit and the field overlaps with the unit text, the field string won't be displayed in its entirety but instead we will slide the text from left to right and back
• Longer strings of fields overlap with units and the text is not readable. We should clearly define areas where field text can fit and where is an area reserved for units. This should never happen.
• We've discussed having optional longer strings which can be displayed on remote devices with bigger screen. We decided to deprecate this idea as the TcMenu protocol should not be misused for handling UI stuff. Instead, people can build their own apps and have longer strings there. They just need to do the mapping from the Item_ID into a proper string.
• Handle long strings in dialogs. Currently we have to manually build a dialog window and to split the strings into multiple lines. Instead, TcMenu should be able to make it for us.