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- Remove deprecated API (e.g. qVariantFromValue).

This costs almost no time, which we easily recoup by the much faster
loading as we can skip the expensive XML parsing that way. More
importantly this cuts the memory cost of loading by half, saving
more than 2GB for level 9.

This fixes loading o5m files with an extra dot in their name.

- Replace QTime for QElapsedTimer
- Replace QImage::byteCount with QImage::sizeInBytes()
- Replace QList::swap with QList::swapItemsAt().

This makes the Natural Earth tile generator work again with their latest
released dataset.

- use the canonical URL (with variables, without namespace);
- let the website handle the fallback to the English language
  if no translated documentation is found. The existing logic
  did not work anyway.

This intends to convert coordinates to 100 nanodegree integer values
(the OSM base resolution), however it misses the fact that the input
is provided in radians, not degrees. This means that we are effectively
reducing the resolution by about 60x. This is enough to introduce visual
glitches up to completely destroying sub-meter structures.

This avoids having to do expensive construction and allocations of those
in their respective tight loops.

This fixes expensive detaches in a number of places.

There is no QLatin1String overload, so each of these calls triggered one
allocation, particularly costly as this function is on a hot path in the
tile generator.

This is used on numerous hot paths, as having a cast function doing
(temporary) allocations is highly surprising.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

They do not belong to an user-facing documentation, but rather to
separate download/build development pages.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

QWebChannel header is used in src/lib/marble/MarbleLegendBrowser.cpp
since commit b42ee5c8 but apparently not always implicitly included.

Downstream report: https://bugs.gentoo.org/728234Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"