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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"

Reasoning:
In the past the login was done together with the creation of the worksheet and the latex typesetting was set during this step.
After an optimization that was done in this area, the login was postponed to the point in time when the first expression needs to be evaluated.
With this it's not possible to the user to change the latex typesetting until the first evaluation is done which is wrong. We want to allow the user
to modify this setting before anything is processed so also the results of the first evaluation are obtained in the proper format (with or without latex).

Moved the functions parseOutput() and parseError() to the base clase Expression and removed multiple obsolete casts in the derived classes.
Furthermore, replaced the remaining occurancies of the deprecated QProcess:pid().

[R] parse the mime type 'image' before the type 'octet-stream' is parsed. This fixes the showing of PNG files for plot results.

Signed-off-by: Snehit Sah <snehitsah@protonmail.com>

[octave] changed the default octave executable from 'octave-cli' to 'octave' which seems to be the only working interface in >6.0 and set the recommended version to 6.2.

BUG: 434271
FIXED-IN: 22.03

BUG: 434812
FIXED-IN: 22.03

[maxima] properly parse the output of the internal help (regression caused by 4a9ca0ec) and also expand/collapse information items in the command entry.

* Enable the copy action in the context menu of the text result item also if no text is selected, copy everything in this case which is the most frequent and the expected behavior (right click and copy to copy the whole result).
* don't try to save the text result if now the file dialog was canceled, i.e. no file name was provided.

[maxima] in case a warning is produced, treat it as such by adding and new text result and don't set the status of the expression to Error.

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 a53a36cb)

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"

* when removing the current placeholder entry during a drag move event, don't ask for confirmation
* more icons in the worksheet context menu
* made Worksheet::showCompletion() public since it's called from another object and we want to use the new signal-slot syntax
* simplified the setting of the short cut for "show completion" in CantorPart
* more forward declarations in Worksheet

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"

Reasoning:
* right now we're asking the backend to produce an EPS file for the plot and convert it via libspectre to PNG to render. We can directly ask the backend to generate the PNG file and remove this unneeded conversion.
* libspectre is very unstable and crashing often, at least on openSuse
* this library doesn't seem to be heavily developed/supported anymore
* later we'll switch to the PDF output in the backend systems and render it via poppler to PNG as it is already done for Jupyter content.

We start removing it for maxima now, other parts of the code will be addressed step by step.

* renamed "Variable Manager" to "Variables"
* properly parse Maxima's output using the current locale
* search for 'julia' and not 'Julia' executable

* don't show any placeholder text in the help panel - we don't do this nowhere else, neither
* code style fixes in the file browser panel
* for panel plugins, set the plugin id as the object name so we can direclty work with it in LabPlot instead of 18n-ed plugin names
* minor cleanup in worksheet.cpp

The latter is only for KF modules to use.

Also include the KDE cmake modules as first thing, as their settings
can influence other included macros.
And drop outdated flags QT_USE_FAST_CONCATENATION &
QT_USE_FAST_OPERATOR_PLUS, superceded by QT_USE_QSTRINGBUILDER

GIT_SILENT

(cherry picked from commit 53054b2b)

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"

An actual Python interpreter is not needed for the build, and only the
development bits of Python are needed for the Python backend.

Make the build of the embedded copy of the discount library use the
same verbosity level of the cantor build.