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(cherry picked from commit 07b9e093)

(cherry picked from commit 86f15812)

* Update date and version numbers
* Remove final whitespaces
* Remove old entities and use kspaceduel entity from kdoctools
* Suitable tags and punctuation
* Add small sreenshots to powerups
* Indent all menu items
* Rework all configuration dialog section

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 6e7c5d37)

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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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(cherry picked from commit ec0a8896)

(cherry picked from commit 7a60a220)

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(cherry picked from commit f9d76a0d)

(cherry picked from commit be266bcc)

(cherry picked from commit 2e500085)

(cherry picked from commit 999e2a30)

(cherry picked from commit 0db88f6c)

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Also add/move license files as required by REUSE specification

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