Fix/map feature

[dforsi]

This PR:

• adds the transmitters.csv file to the resources and converts its encoding from ISO-8859-1 to UTF-8 to show the accented letters
• modifies the table of map items settings
  • to right align all numeric cells
  • to use a QSpinBox for the "Filter Distance" cells
  • to do a case insensitive sorting of column containing the labels

For the QSpinBox of "Filter Distance" I set a minimum value of zero and a maximum of 10000 km; I used setSpecialValueText() to replace the zero with one space so the the look of the table isn't too much different from before (we can't use an empty string or a nullptr because they disable the replacement).

The case sensitive sorting is needed otherwise "Airport" and "Airspace" were coming after APTdemod.

[srcejon]

For the QSpinBox of "Filter Distance" I set a minimum value of zero and a maximum of 10000 km;

Half the circumference of the Earth is larger than that, so probably should be a bit bigger.

[srcejon]

I used setSpecialValueText() to replace the zero with one space so the the look of the table isn't too much different from before (we can't use an empty string or a nullptr because they disable the replacement).

How does a user enter "No filter"? Can they delete the characters or do they have to insert a space? If the latter, then it would be better to create a custom spin box, like DMSSpinBox etc.

[dforsi]

For the QSpinBox of "Filter Distance" I set a minimum value of zero and a maximum of 10000 km;

Half the circumference of the Earth is larger than that, so probably should be a bit bigger.

I was just thinking of a big number, but we can set it to 40075+1

[dforsi]

How does a user enter "No filter"? Can they delete the characters or do they have to insert a space? If the latter, then it would be better to create a custom spin box, like DMSSpinBox etc.

Now, with the commit that adds QAbstractSpinBox::CorrectToNearestValue the user can delete the characters, or type a zero which disappears when the cell looses the focus.

[f4exb]

@srcejon Hello Jon, can it be merged?

[srcejon]

@srcejon Hello Jon, can it be merged?

Yep