Added functionality to configure blinking of CTL tag

[tkloy24]

This addition allows to configure the distance at which the "CTL" text starts blinking. If the configured threshold value is not reached the text will be static, otherwise it will blink to receive controller's attention.

[DrFreas]

Hi,
thank you for your contribution. However, if enabled, the CTL flag does already blink. Also, if the default distance is the same as the distance where the tag item is shown anyway, what's the point of it anyway? Or do you want to have just the CTL to blink and the requests not?
I don't want to sound harsh, but I need a bit more understanding what you want to archieve here, because this functionality is already there.

[tkloy24]

Hi DrFreas,

sure, let me explain the idea: Currently the CTL-flag will start blinking as soon as an aircraft passes the ctldist which is 40 nm by default.

However it would be nice to have a two-step solution:

1. An aircraft is in the area but has no landing clearance (Static red "CTL" text for information)
2. An aircraft is pretty close to the aircraft and still has no landing clearance (Blinking "CTL" flag to show urgency)
   --> I believe that this would help to identify and prioritize landing traffic that really needs attention.

I have set the value for distanceCTLBlink to 40 nm in order to allow backward compatibility: If a user wishes to have the logic as it always was he does not need to change anything. Users who would like the two-step mode can then simply adjust the distanceCTLBlink to any value that suits them best.

[DrFreas]

Thank you for clarifying. I already thought something like this, but wanted to make sure you really want this.
I will consider merging this, however I'm thinking about even more awareness maybe, like a flashing background behind the CTL flag to really raise big awareness. So you would have the normal behaviour as usual, but then like an "alert" that needs your immediate attention. So maybe that the CTL is written in black with a red background?

[tkloy24]

Sounds great, I also like the idea of an even "more urgent" indication like the flashing background if Euroscope supports something like this in lists or tags.