Base of documentation for builders

[coverprice]

Added the beginnings of a usage doc for Build Mode users, based on testing plan docs from #93 . This can be the foundation for a more sophisticated user guide.

[jules43]

Makes sense. Worth noting that I have some ideas on how to improve build mode (and custom pins) to make it a bit more user friendly (and consistent) partly based on how Animal Well does it.

Custom pins bit:
#113

With the custom pins done updating Build Mode would hopefully be pretty easy:
#112 (contains multiple child tasks)

The work flow would still be to make changes that are kept in a change list in local storage and then export them via a text file or the clipboard to get them into the base map data.

[jules43]

We should distinguish between custom map pins (a normal user-centric feature) and build mode (specifically aimed at adding UGC changes to the map.

Custom map pins is aimed at having the map running along side the game and dropping map pins on to the map as notes to yourself. Ideally you'd be able to change the appearance of a custom pin and add a title/note, and then save/load your custom pins.

At the moment if you want to add a new UGC feature to the base map you can use custom pins to help you do that but its a hack.

1. Place a custom pin where you want it
2. Copy custom pins to clipboard
3. Paste custom pins to a file
4. Add a set of area:name:type:lat:lng:alt blanks to custom json
5. Copy your custom pin positions and reformat as lat/lng/alt in custom json
6. Customise the blanks
7. Reload the map

As mentioned in my comment I have a set of proposals that might be fairly quick to do to make this much easier.

[jules43]

See my comments on the discussion thread but no reason not to merge it