Python: add requirements file to python project wizard

This is the de facto standard way of defining project dependencies. And
those files can be used to install dependencies via pip.

Change-Id: Ibfe37624b66d757cd331aee9c51090200b3bad39
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

share/qtcreator/templates/wizards/projects/qtforpythonapplication/empty/wizard.json

@@ -81,6 +81,10 @@
                     "target": "%{SrcFileName}",
                     "openInEditor": true
                 },
+                {
+                    "source": "../requirements.txt",
+                    "target": "requirements.txt"
+                },
                 {
                     "source": "../../git.ignore",
                     "target": ".gitignore",

share/qtcreator/templates/wizards/projects/qtforpythonapplication/mainwindow/wizard.json

@@ -125,6 +125,10 @@
                     "target": "%{MainPyFileName}",
                     "openInEditor": true
                 },
+                {
+                    "source": "../requirements.txt",
+                    "target": "requirements.txt"
+                },
                 {
                     "source": "../../git.ignore",
                     "target": ".gitignore",

share/qtcreator/templates/wizards/projects/qtforpythonapplication/qtquickapplication/wizard.json

@@ -120,6 +120,10 @@
                     "target": "%{QmlFileName}",
                     "openInEditor": true
                 },
+                {
+                    "source": "../requirements.txt",
+                    "target": "requirements.txt"
+                },
                 {
                     "source": "../../git.ignore",
                     "target": ".gitignore",

share/qtcreator/templates/wizards/projects/qtforpythonapplication/requirements.txt

@@ -0,0 +1 @@
+%{PySideVersion}

share/qtcreator/templates/wizards/projects/qtforpythonapplication/widget/wizard.json

@@ -129,6 +129,10 @@
                     "source": "../main_widget.ui",
                     "target": "form.ui"
                 },
+                {
+                    "source": "../requirements.txt",
+                    "target": "requirements.txt"
+                },
                 {
                     "source": "../../git.ignore",
                     "target": ".gitignore",