Fix trailing whitespace in multiple files

Also fix formatting of CODING_GUIDELINES.md

src/webui/api/appcontroller.h

@@ -48,7 +48,7 @@ private slots:
     void preferencesAction();
     void setPreferencesAction();
     void defaultSavePathAction();
-    
+
     void networkInterfaceListAction();
     void networkInterfaceAddressListAction();
 };

src/webui/www/tstool.py

@@ -26,7 +26,7 @@
 # modify file(s), you may extend this exception to your version of the file(s),
 # but you are not obligated to do so. If you do not wish to do so, delete this
 # exception statement from your version.
- 
+
 import argparse
 import copy
 import os
@@ -62,7 +62,7 @@ def processTranslation(filename, sources):
     except Exception:
         print('\tFailed to parse %s!' % (os.path.normpath(filename)))
         return
-    
+
     root = tree.getroot()
     for context in root.findall('context'):
         context_name = context.find('name').text
@@ -70,16 +70,16 @@ def processTranslation(filename, sources):
         if not has_context and no_obsolete:
             root.remove(context)
             continue
-        
+
         for message in context.findall('message'):
             for location in message.findall('location'):
                 message.remove(location)
-                
+
             source = message.find('source').text
             translation = message.find('translation')
             if has_context and source in sources[context_name]:
                 sources[context_name].remove(source)
-                    
+
                 trtype = translation.attrib.get('type')
                 if (trtype == 'obsolete') or (trtype == 'vanished'):
                     del translation.attrib['type'] # i.e. finished
@@ -107,7 +107,7 @@ def processTranslation(filename, sources):
         for source in sources[context_name]:
             message = ET.SubElement(context, 'message')
             ET.SubElement(message, 'source').text = source
-            ET.SubElement(message, 'translation', {'type': 'unfinished'}) 
+            ET.SubElement(message, 'translation', {'type': 'unfinished'})
 
     # prettify output xml
     indent = ' ' * 4
@@ -118,13 +118,13 @@ def processTranslation(filename, sources):
         context.find('./name').tail = '\n' + indent
         messages = context.findall('./message')
         if len(messages) == 0: continue
-        
+
         for message in messages:
             message.text = '\n' + (indent * 2)
             message.tail = '\n' + indent
             elems = message.findall('./')
             if len(elems) == 0: continue
-            
+
             for elem in elems:
                 elem.tail = '\n' + (indent * 2)
             elems[-1:][0].tail = '\n' + indent