Filter tasks sharing some properties and bulk setter

[le-jeu]

Some feature requests have in common the need to color all links sharing a property, like the source portal or the assigned agent.
I have some ideas for this:

1. the Link/Checklist: Filter per zone/comment/agent/state and color filtered (listed) links #318 branch to select a subset of the links in the checklist and color them
2. integrate buttons (for instance) in the link list (wrt a portal) to color all inbound or outbound links
3. create a UI to give (client-side) a color to each agent and use this data to color implicitly the rendering
4. rule base coloring (rendering won't use the color attribute for a link) (see 9d9d1b6 for pin color)

Properties:

• by assignment
• by target
• by source
• by zone

Related: #318 #335 #350 #191

[cloudkucooland]

(1) is the "least surprising" - it is clear what the user wants and does it without realizing that the op data is now more than "just data" but also instructions to the display logic
(2) same - probably the easiest to implement
(3) moderately surprising - would require a change in all clients to display consistently
(4) most surprising - "WHY ARE ALL MY LINKS BLUE!" ... "because you wrote a rule that set all the links to blue...."

[le-jeu]

Some more ideas that go more to a new dialog and filter feature with global effect on the UI

Properties:

• Link/Marker/Both
• Assignment(s)
• Portal + From/To/Both
• State(s)
• Zone(s)
• Team (extend assignment)

Actions:

• Filter in the UI: Map and/or Check/Marker/Link-lists
• Bulk change:
  • Color
  • State
  • Assignment(s?)
  • Zone
• Delete

Filter feature:
Given the use case, this can follow CNF pattern. A filter is a conjunction of disjunctions: for each property the task can have some values, and we want the tasks that fill all constraints.
We can be more generic, and have an usual pattern (OR/AND) in UI like
or over-engineering it like

Note that the filter backend can be generic while the UI is not.
See https://github.com/le-jeu/ingress-intel-total-conversion/blob/5861c0611fe1f6264b2b1fdca16150d939d98d4c/core/code/filters.js as an backend idea (using DNF)