Merge pull request #3549 from pavelmachek/m_31_trail

trail: initial import

apps/trail/ChangeLog

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+0.01: New App!
+

apps/trail/README.md

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+# Trail Rail ![](app.png)
+
+Simple app to follow GPX track
+
+Written by: [Pavel Machek](https://github.com/pavelmachek)
+
+After GPS fix is acquired, it displays familiar arrow with road in
+front of you. It never stores whole track in memory, so it should work
+with fairly large files.
+
+GPX files can be obtained from various services, www.mapy.cz is one of
+them (actually uses openstreetmap data for most of the world).
+
+## Preparing data
+
+"gpx2egt.sh < file.gpx > t.name.egt" can be used to prepare data, then
+upload it to watch.
+

apps/trail/app-icon.js

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+require("heatshrink").decompress(atob("mEwhHXAH4AHgAqpvownEQ4wEMEYw8YMgw4F84wwMH4woeQQvlEwwvCGFgvqE4gvDGFAvHAFQv/AH74YElYvjF3Je/FzV9F8wuLF8QhHL34u/RqSOjFxYvpF2gvlRQwuoAAIvqFoQvJFsoupF9wtFF+CNuX34xfF1YwDF9oA/AH4AyA=="))

apps/trail/gpx2egt.sh

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+#!/bin/bash
+grep "trkpt lat" | sed 's/.*trkpt.lat=.//' | sed 's/. lon=./ /' | sed 's/".$//'

apps/trail/metadata.json

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+{ "id": "trail",
+  "name": "Trail Rail",
+  "version":"0.01",
+  "description": "Follow a GPX track in car or on bike",
+  "icon": "app.png",
+  "readme": "README.md",
+  "supports" : ["BANGLEJS2"],
+  "tags": "outdoors,gps,osm",
+  "storage": [
+      {"name":"trail.app.js","url":"trail.app.js"},
+      {"name":"trail.img","url":"app-icon.js","evaluate":true}
+  ]
+}