rename PythonEditor plugin to Python

The plugin does not only contain a pure editor, but all kind of support
for a programming language like project and run support.

Change-Id: I1251367c8db2e7a54986415ffc5b860cb210de3c
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/python/python.pro

@@ -0,0 +1,20 @@
+include(../../qtcreatorplugin.pri)
+
+DEFINES += \
+    PYTHON_LIBRARY
+
+HEADERS += \
+    pythonplugin.h \
+    pythoneditor.h \
+    pythonconstants.h \
+    pythonhighlighter.h \
+    pythonindenter.h \
+    pythonformattoken.h \
+    pythonscanner.h \
+
+SOURCES += \
+    pythonplugin.cpp \
+    pythoneditor.cpp \
+    pythonhighlighter.cpp \
+    pythonindenter.cpp \
+    pythonscanner.cpp