(cherry picked from commit 2fb0c3e1)

(cherry picked from commit a0b2113d)

(cherry picked from commit 606e43a5)

(cherry picked from commit 09f59121)

Also include KDE & ECM cmake modules before checking other deps,
for consistency and to ensure KDE settings are deployed before doing more.

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* Update date and version numbers
* Use a suitable tagging
* Renew the screenshots

(cherry picked from commit feb042e0)

(cherry picked from commit ed5b81cd)

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(cherry picked from commit 1852334d)

(cherry picked from commit b176ff95)

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"

(cherry picked from commit c72abf09)

(cherry picked from commit 3b462943)

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