External tools: Fall back to active project's Qt

for the Qt related external tools, if there is no open document with a
project.

Change-Id: I1d059d70e5163921a8d98b6a93224aef1fbf1743
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/share/qtcreator/externaltools/lrelease.xml

@@ -11,6 +11,7 @@
     <order>2</order>
     <executable>
         <path>%{CurrentDocument:Project:QT_INSTALL_BINS}/lrelease</path>
+        <path>%{ActiveProject:QT_INSTALL_BINS}/lrelease</path>
         <path>lrelease</path>
         <arguments>%{CurrentDocument:Project:FilePath}</arguments>
         <workingdirectory>%{CurrentDocument:Project:Path}</workingdirectory>

src/share/qtcreator/externaltools/lupdate.xml

@@ -11,6 +11,7 @@
     <order>1</order>
     <executable>
         <path>%{CurrentDocument:Project:QT_INSTALL_BINS}/lupdate</path>
+        <path>%{ActiveProject:QT_INSTALL_BINS}/lupdate</path>
         <path>lupdate</path>
         <arguments>%{CurrentDocument:Project:FilePath}</arguments>
         <workingdirectory>%{CurrentDocument:Project:Path}</workingdirectory>

src/share/qtcreator/externaltools/qml.xml

@@ -11,6 +11,7 @@
     <order>1</order>
     <executable>
         <path>%{CurrentDocument:Project:QT_INSTALL_BINS}/qml</path>
+        <path>%{ActiveProject:QT_INSTALL_BINS}/qml</path>
         <path>qml</path>
         <arguments>%{CurrentDocument:FilePath}</arguments>
         <workingdirectory>%{CurrentDocument:Path}</workingdirectory>

src/share/qtcreator/externaltools/qmlscene.xml

@@ -11,6 +11,7 @@
     <order>1</order>
     <executable>
         <path>%{CurrentDocument:Project:QT_INSTALL_BINS}/qmlscene</path>
+        <path>%{ActiveProject:QT_INSTALL_BINS}/qmlscene</path>
         <path>qmlscene</path>
         <arguments>%{CurrentDocument:FilePath}</arguments>
         <workingdirectory>%{CurrentDocument:Path}</workingdirectory>