add uninstall scripts

companion/linux/chrome/uninstall.sh

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+#!/bin/sh
+rm -f ~/.config/google-chrome/NativeMessagingHosts/singlefile_companion.json

companion/linux/firefox/uninstall.sh

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+#!/bin/sh
+rm -f ~/.mozilla/native-messaging-hosts/singlefile_companion.json

companion/mac/chrome/uninstall.sh

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+#!/bin/sh
+rm -f ~/Library/Application Support/Google/Chrome/NativeMessagingHosts/singlefile_companion.json

companion/mac/firefox/uninstall.sh

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+#!/bin/sh
+rm -f ~/Library/Application Support/Mozilla/NativeMessagingHosts/singlefile_companion.json

companion/win/chrome/uninstall.bat

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+@echo off
+reg delete "HKEY_CURRENT_USER\Software\Google\Chrome\NativeMessagingHosts\singlefile_companion" /ve /f

companion/win/firefox/uninstall.bat

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+@echo off
+reg delete "HKEY_CURRENT_USER\Software\Mozilla\NativeMessagingHosts\singlefile_companion" /ve /f