trizen/raku-rosettacode: Tasks from Rosettacode implemented in Raku @ 22.07

trizen fc8949ad1c Updated.		vor 3 Jahren
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XML	986b637005 Gitbook does not yet understand the `raku` language tag. Revert to `perl`.	vor 4 Jahren
XML_validation.md	1143259223 Update.	vor 3 Jahren
XXXX_redacted.md	986b637005 Gitbook does not yet understand the `raku` language tag. Revert to `perl`.	vor 4 Jahren
Xiaolin_Wu's_line_algorithm.md	986b637005 Gitbook does not yet understand the `raku` language tag. Revert to `perl`.	vor 4 Jahren