Get number of visited systems by data provider

[bikerunner]

Change:

• set the number of visited systems from copilot with a data provider

Advantage:

• removes direct php dependency to copilot code
• developers does not need to create a fake php file
• value can be set dynamically by copilot
• does not need file rewrite by copilot (possible parallel access issue)

[saimonberlin]

whereis the code for the co-pilot? i would like to make one for my alliance.

[Thricehappy]

@saimonberlin Allison's code is not open sourced.