LoadScripts.vbs refactor to allow extension points for LoadScriptBootstrap.vbs

[baerrach]

Use Sparx EA LOCAL PATH dialog to specify location of scripts to load.
There is no API to uses these from VB, must read the file and parse directly:
%appdata%\Sparx Systems\EA\paths.txt
(EA-Matic should share this with the save scripts location and update it)

• refactor variables in main to global variables:
  • overwriteExisting
  • allScripts
  • allGroups
• use global variables instead of function parameters
• rename global variables:
  • allScripts -> allScriptsInSparxModel
  • allGroups -> allGroupsInSparxModel

Fix getScriptFromFile() to not create a new Script in the loop, it only needs to be done once