build-plugin: also accept + in message filename detection

See merge request kde/kate!1

... such as e.g. in /usr/include/c++

Otherwise, in a message such as the following, only the part following c++
is extracted as a filename:
/usr/include/c++/8/bits/basic_string.h:420:7:

support all three styles of hover response:

contents: MarkedString | MarkedString[] | MarkupContent;

=> this is needed to have functional hover for Rust rls

in addition: cut too long tool tips until we have some better way to show stuff

BUG: 410742

Summary: The documentation of the syntax highlighting is updated, adding a brief description and example of include-keywords.

Reviewers: #kate, dhaumann, cullmann

Reviewed By: #kate, cullmann

Subscribers: kwrite-devel, kde-doc-english

Tags: #kate, #documentation

Differential Revision: https://phabricator.kde.org/D23050

this allows easier editing of default server configs we ship
handle debug mode via optional commandDebug key

Summary: It (should) simplify code a bit. It some cases prevents copying strings, shared_ptrs.

Reviewers: #kate, cullmann

Reviewed By: #kate, cullmann

Subscribers: cullmann, kwrite-devel, #kate

Tags: #kate

Differential Revision: https://phabricator.kde.org/D23010

Summary:
Use the standardized language id in more places.

Why?
- the LSP names are "standardized"
- we can internally map different C++/... highlightings to the same canonical LSP lanuage id name

Reviewers: mnauwelaerts, dhaumann

Reviewed By: mnauwelaerts, dhaumann

Subscribers: dhaumann, kwrite-devel

Tags: #kate

Differential Revision: https://phabricator.kde.org/D23009

Summary:
now for me rls works for some imple project like

https://github.com/rust-lang/rustfmt

Reviewers: mnauwelaerts

Subscribers: dhaumann, univerz, kwrite-devel

Tags: #kate

Differential Revision: https://phabricator.kde.org/D22963

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"