Pass non-trivial/large function args by reference

Fixes a bunch of `-Wclazy-function-args-by-ref` warnings. See
https://github.com/KDE/clazy/blob/master/docs/checks/README-function-args-by-ref.md
for details.

Most of these changes are automated, using the clazy fixit by setting
the `CLAZY_EXPORT_FIXES` before compilation and then running:

    $ mkdir /tmp/patch
    $ find ../src -iname "*.yaml" -exec mv {} /tmp/patch \;
    $ clang-apply-replacements /tmp/patch

1 files changed, 1 insertions, 1 deletions

diff --git a/src/library/dlganalysis.cpp b/src/library/dlganalysis.cpp
index a3f9a1bf34..a75c41255f 100644
--- a/src/library/dlganalysis.cpp
+++ b/src/library/dlganalysis.cpp
@@ -116,7 +116,7 @@ void DlgAnalysis::loadSelectedTrack() {
     m_pAnalysisLibraryTableView->loadSelectedTrack();
 }
 
-void DlgAnalysis::loadSelectedTrackToGroup(QString group, bool play) {
+void DlgAnalysis::loadSelectedTrackToGroup(const QString& group, bool play) {
     m_pAnalysisLibraryTableView->loadSelectedTrackToGroup(group, play);
 }