Fix duplicate entries and broken formatting in cheat files.

There may be others, but these are the obvious ones that tripped our
parser.
Remove leading/trailing whitespace in some cheat strings.
update build helper and install scripts to account for new desktop/icon files included in mupen64plus-ui-console
Merge pull request #14 from littleguy77/cheat_file_fixes

Cheat file fixes
Remove duplicate cheatfile entry (NFL Quarterback Club 2000).
Remove duplicate cheatfile entry (Turok 2 - Seeds of Evil (FGD)).
Merge pull request #15 from littleguy77/cheat_file_fixes

Cheat file fixes
remove old mupen64plus.cht file, fix install/uninstall script to use now mupencheat.txt file instead