tools: update MapPatcher.jar, add mapclean helper

MapPatcher.jar can now take a user-defined tile line when conflicted.
Added a clean_map_git.sh file that will automatically clean maps
without needing a prepare_map.bat call beforehand. Needs to be run in
git bash, or have .sh associated with something that has git.
Fixed line endings in install.txt to show up right in notepad.

Signed-off-by: Mloc-Argent <colmohici@gmail.com>