Add support for Google Takeout Location History (#1160)

* Add support for Google Takeout Location History

This adds support for parsing the location history provided by Google Takeout.
This makes it possible to convert a month's, year's, or your entire location
history at once instead of having to export one day's history at a time on
Google Maps.

There is documentation in the `xmldoc` folder with some examples.

It works great, but there are one, possibly two, other additions I'd like to
make in following diffs:

1. Add the ability to select date ranges. For example, I went on a road trip
   that started in the last week of February, but right now I can only select
	 tracks at the resolution of a whole month.

2. Add support for the higher-resolution "roadSegment" blocks in newer
   "activitySegment" blocks. This will have to be optional as you have to
	 query the Google Maps API to get lat/long, which costs money. However,
	 if you're willing to pay for it, you can get great detail out of it.
	 They look like this:

```
       "roadSegment": [{
          "placeId": "ChIJBdXmuuWaK4gRoiClERhZcy8",
          "duration": "76s"
        }, {
          "placeId": "ChIJ4ekNlOWaK4gRxu-moMRFo60",
          "duration": "58s"
        }, {
          "placeId": "ChIJ10qEheWaK4gRQ1T24wEuuN4",
          "duration": "58s"
        }, {
          "placeId": "ChIJe7NWfu-aK4gRFHBB6P0PMe4",
          "duration": "58s"
[...]
```

* rename variable

* this TODO is done

* now builds on focal, fix documentation

* patch -p2 < ~/testo.log

* use `&&` instead of `and` for old compilers

* don't leak objects when we skip events at exact lat/lon 0/0

* use a reference (even though the compiler would have optimized that away)

* rename to googletakeout

* fix docs

* Address code review requests

* add `googletakeout.h` to HEADERS
* convert most `#define`s to static members
* don't pollute global namespace
* rename logging functions
* convert some methods to static functions for clang-tidy
* `title_case` loop by reference instead of by index (clang-tidy)
* better use of debugging levels
* drop dead simplifiedRawPath code for now
* drop empty tracks
* default constructor for GoogleTakeoutInputStream
* add some tests that check the content of the data

Also, I found some unofficial documentation about the location history
format and added that (thanks @CarlosBergillos !)

* apply @tsteven4 's patch. thank you!!

* add license

* fix logging

* As I assigned the correct license to my code, I am skeptical that this makes a difference, but give Robert co-copyright.

* make the test more boring

* rm xml_slice

* revert constructor change from @tsteven4 's patch

* apply @tsteven4 's latest constructor

* apply @tsteven4 's latest patch -- `cmake --build . --target check` passes

---------

Co-authored-by: tsteven4 <[email protected]>

.gitignore

@@ -10,11 +10,12 @@
 /debug/
 /gpsbabel
 /gpsbabel-debug
-/gpsbabel_coverage.xml
 /gpsbabel.exe
 /gpsbabel.fo
 /gpsbabel.html
 /gpsbabel.pdf
+/gpsbabel_autogen/
+/gpsbabel_coverage.xml
 /Makefile
 .qmake.cache
 .qmake.stash
@@ -26,11 +27,13 @@
 *.a
 .ninja_deps
 .ninja_log
+.qt
 build.ninja
 rules.ninja
 cmake_install.cmake
 CMakeCache.txt
 CMakeFiles/
+CTestTestfile.cmake
 /GPSBabel[0-9]*.[0-9]*.[0-9]*/
 /GPSBabel[0-9]*.[0-9]*.[0-9]*.tar.bz2
 /makelinuxdist.sh
@@ -47,3 +50,4 @@ CMakeFiles/
 /gbversion.h
 /qrc_gpsbabel.cpp
 /.vscode/
+Testing

CMakeLists.txt

@@ -87,6 +87,7 @@ set(ALL_FMTS ${MINIMAL_FMTS}
   geocache.cc
   geojson.cc
   globalsat_sport.cc
+  googletakeout.cc
   gtm.cc
   gtrnctr.cc
   html.cc
@@ -213,6 +214,7 @@ set(HEADERS
   geojson.h
   globalsat_sport.h
   geo.h
+  googletakeout.h
   gpx.h
   grtcirc.h
   gtrnctr.h
@@ -380,6 +382,7 @@ set(TESTS
   geojson
   geo
   globalsat_sport
+  googletakeout
   gpsdrive
   gpx
   grapheme