[Rails-devel] Push request: Refactored network info (incl. keyboard shortcut and version for end-users)

[Frederick W. <fre...@go...>]

Feel free to push this into origin/master.

This patch is independent of the patch for forced train purchases.

---Frederick

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Added user-friendly network info including keyboard shortcut

Provided for a non-developer version of the network info menu.
Differences to the developer-only version (available before):
- omitting the menu item for the complete network graph
- providing a localized dialog text for the dialog
- omitting train run information and train simulation

Applied further extensions to network info menu (also valid for
the developer-only version):
- Keyboard shortcut (Ctrl+N) dynamically assigned to the network info
  menu item of the currently operating company
- Network info run visualization takes care of potential conflicts
  with the visualization of the set revenue step
- Network info run visualization is turned off after the dialog

Provided functionality covers the use case described in feature
request 3064835 (and more).