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/precommit.py

@@ -20,12 +20,12 @@ def main(repo):
                 head_blob = repo[repo[repo.head.target].tree[path].id]
             except KeyError:
                 # New map, no entry in HEAD
-                print(f"Converting new map: {path}")
+                print("Converting new map: {}".format(path))
                 assert (status & pygit2.GIT_STATUS_INDEX_NEW)
                 merged_map = index_map
             else:
                 # Entry in HEAD, merge the index over it
-                print(f"Merging map: {path}")
+                print("Merging map: {}".format(path))
                 assert not (status & pygit2.GIT_STATUS_INDEX_NEW)
                 head_map = dmm.DMM.from_bytes(head_blob.read_raw())
                 merged_map = merge_map(index_map, head_map)
@@ -37,13 +37,13 @@ def main(repo):
 
             # write to the working directory if that's clean
             if status & (pygit2.GIT_STATUS_WT_DELETED | pygit2.GIT_STATUS_WT_MODIFIED):
-                print(f"Warning: {path} has unindexed changes, not overwriting them")
+                print("Warning: {} has unindexed changes, not overwriting them".format(path))
             else:
                 merged_map.to_file(os.path.join(repo.workdir, path))
 
     if changed:
         repo.index.write()
-        print(f"Merged {changed} maps.")
+        print("Merged {} maps.".format(changed))
     return 0
 
 if __name__ == '__main__':