Single source the package version

Define one place to store the Manuskript version so that it can be
used in multiple locations.

Reference:

Single-sourcing the package version
https://packaging.python.org/guides/single-sourcing-package-version/

manuskript/main.py

@@ -9,8 +9,7 @@ from PyQt5.QtGui import QIcon
 from PyQt5.QtWidgets import QApplication, qApp
 
 from manuskript.functions import appPath, writablePath
-
-_version = "0.4.0"
+from manuskript.version import getVersion
 
 faulthandler.enable()
 
@@ -20,9 +19,9 @@ def run():
     app.setOrganizationName("manuskript")
     app.setOrganizationDomain("www.theologeek.ch")
     app.setApplicationName("manuskript")
-    app.setApplicationVersion(_version)
+    app.setApplicationVersion(getVersion())
     
-    print("Running manuskript version {}.".format(_version))
+    print("Running manuskript version {}.".format(getVersion()))
     icon = QIcon()
     for i in [16, 32, 64, 128, 256, 512]:
         icon.addFile(appPath("icons/Manuskript/icon-{}px.png".format(i)))

manuskript/version.py

@@ -0,0 +1,9 @@
+# --!-- coding: utf8 --!--
+
+# Single source the package version
+# https://packaging.python.org/guides/single-sourcing-package-version/
+
+__version__ = "0.4.0"
+
+def getVersion():
+    return __version__