Use vendored ogre & fix python install location

[Tobias-Fischer]

Full rebuild of all platforms to Unix python install location #41 and Gazebo issues #24

[Tobias-Fischer]

/cc @wolfv @traversaro

[Tobias-Fischer]

@traversaro - can you see what's wrong with the Windows build? I can't see the actual error that occurs ..

[traversaro]

@traversaro - can you see what's wrong with the Windows build? I can't see the actual error that occurs ..

I think the actual Windows error is:

2023-02-04T10:51:21.1369691Z The input line is too long.
2023-02-04T10:51:21.1370054Z The syntax of the command is incorrect.

in my experience, this happens one a environment variable (such as PATH) is too long, so if it is used in a command the resulting command is too long (~8191 char,see https://learn.microsoft.com/en-US/troubleshoot/windows-client/shell-experience/command-line-string-limitation). It happens quite frequently if you activate several times the same environment, especially if the vcvars.bat if sourced every time. However, I am not sure what it is the offending command/env variable in this case. I am not sure why this is haoppening now.

[Tobias-Fischer]

I'm out of ideas here .. I am not able to set the path consistently across different steps :(. I remember you played with this before @wolfv?

[Tobias-Fischer]

This seems to be fine - I'll merge it, will fix the Windows issues separately.