Wrap lines automatically at 120 character margin

Problem: bisq-network/style#3 indicates code should be wrapped at 120
characters, but it is likely that people will forget and that this habit
will only change slowly.

Solution: Configure IDEA to wrap lines automatically when typing past
120 characters, forcing the reminder to happen in real time. If this
becomes a nuisance, we can remove it later.

Note that this change also explicitly sets the RIGHT_MARGIN value to
120, even though this is already IDEA's default value. This is simply
to be explicit and self-documenting.

.idea/codeStyles/Project.xml

@@ -171,7 +171,9 @@
       <option name="KEEP_BLANK_LINES" value="true" />
     </Properties>
     <codeStyleSettings language="JAVA">
+      <option name="RIGHT_MARGIN" value="120" />
       <option name="BLANK_LINES_BEFORE_PACKAGE" value="1" />
+      <option name="WRAP_ON_TYPING" value="1" />
     </codeStyleSettings>
   </code_scheme>
 </component>