Integrating mapmerge2 checks into Travis (#5616)

Okay, this update is kinda big. Summary:

- Trimmed unused keys in Exodus telecomms

- Adds script that will run mapmerge2 on Travis to check branch for unused keys or key overflow, etc.

- Fixes matching indentation style in tag-matcher and converts it to use Python 3.6

- Converts mapmerge2 to be used by Python 3.4 and above. Instead of 3.6

- Removes Windows 1252 characters from Communication-blackout.dm that were not able to be seen in UTF-8 format.

Note: the last commit will fail because currently main level is broken

Example of no map issues:
![2018-11-15_li](https://user-images.githubusercontent.com/25555314/48592180-0fd7be80-e8fc-11e8-80b9-cd5af32540e3.jpg)

Example of issues:
![2018-11-15_li 2](https://user-images.githubusercontent.com/25555314/48592190-15cd9f80-e8fc-11e8-99bd-6da4b4c2b9d8.jpg)

tools/mapmerge2/frontend.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 # Common code for the frontend interface of map tools
 import sys
 import os
@@ -93,26 +94,26 @@ def process(settings, verb, *, modify=True, backup=None):
         return
 
     if modify:
-        print(f"Maps WILL{'' if settings.tgm else ' NOT'} be converted to tgm.")
+        print("Maps WILL{} be converted to tgm.".format('' if settings.tgm else ' NOT'))
         if backup:
             print("Backups will be created with a \".before\" extension.")
         else:
             print("Warning: backups are NOT being taken.")
 
-    print(f"\nWill {verb} these maps:")
+    print("\nWill {} these maps:".format(verb))
     for path_str in maps:
         print(pretty_path(settings, path_str))
 
     try:
-        confirm = input(f"\nPress Enter to {verb}...\n")
+        confirm = input("\nPress Enter to {}...\n".format(verb))
     except KeyboardInterrupt:
         confirm = "^C"
     if confirm != "":
-        print(f"\nAborted.")
+        print("\nAborted.")
         return
 
     for path_str in maps:
-        print(f' - {pretty_path(settings, path_str)}')
+        print(" - {}".format(pretty_path(settings, path_str)))
 
         if backup:
             shutil.copyfile(path_str, path_str + ".before")
@@ -120,7 +121,7 @@ def process(settings, verb, *, modify=True, backup=None):
         try:
             yield path_str
         except Exception as e:
-            print(f"Error: {e}")
+            print("Error: {}".format(e))
         else:
             print("Succeeded.")