add Scripts to PATH on Windows

[dirk-thomas]

Work around different default installation path for Python scripts on Windows, see ament/ament_tools#156 (comment).

Before:
After: (much further - but not all the way yet...)

[dirk-thomas]

Not to a big surprise this pushed us over the max length for the PATH environment variable again. Therefore I added a second commit which only adds paths when they actually exist:

[mikaelarguedas]

... env var max length on windows ... How do we plan to handle thati n the future? just recommend to users to never "build in isolation" (aka install in isolation) on windows ?

[dirk-thomas]

... env var max length on windows ... How do we plan to handle thati n the future?

Someone has to take on the pleasure task to write PowerShell scripts rather than Batch scripts. It feels to me that you want to volunteer for this glorious task 😜

[mikaelarguedas]

Someone has to take on the pleasure task to write PowerShell scripts rather than Batch scripts. It feels to me that you want to volunteer for this glorious task

Oh I didn't know it was a limitation of batch and not the system, looks like you know a lot more than me about this 😉

[dirk-thomas]

Oh I didn't know it was a limitation of batch and not the system, looks like you know a lot more than me about this 😉

Oh, thank you 😄 I am happy to share the knowledge if anybody would like to work on it... 😇