Support alternate config file location

[tschf]

Use case:

• No version control
• Source code in a shared network folder
• Want to store connections locally

[tschf]

Alternate suggestion. Still use a config in the file root, but point to a connection file store elsewhere. The file would be a single line file containing the connect string user/pass@ORCL

[zhudock]

possibly under User Settings odb-task.targets, instead of in their own file?

e.g.

"odb-task.sqlcl-path": "sql",
"odb-task.sqlplus-path": "sqlplus",
"odb-task.targets": [
    {
        "targetName":"DEV",
        "connectionString":"user/password@DEV"
    },
    {
        "targetName":"QA",
        "connectionString":"user/password@QA"
    }
]