Dependency check and /root/.profile fixes

[mattchis]

• Added a dependency check for unzip. If unzip is not found the script will exit.
• Fixes for the /root/.profile file:
  • Fixed the issue when installing the LinuxRMM-Script the /root/.profile PATH variable is incorrect.
  • Added a check_profile function to check the integrity of the /root/.profile PATH variable and correct any issues it my find. Running the update function will correct the profile as well.
• Fixed a bug with doubling the PATH variable in the /root/.profile
• Added uninstall feature.
• Updated documentation for how to use the uninstall feature.