erbb build doesn't support spaces in project path or eurorack-blocks path

[ohmtech-rdi]

(missing log)

In essence, make doesn't support spaces in makefiles.

So we have two cases:

• Spaces in the path to eurorack-blocks, and inherently when building libDaisy
• Space in the path to the user's project, and inherently when building the project itself

We can't really do much about that, except making some sort of ugly hacks.

A better approach would have been probably to use cmake.

For now let's warn the user (with an error):

• At the erbb setup phase, to detect spaces in eurorack-blocks path, typically in check_environment
• At the erbb configure phase, to detect spaces in the user's project path.

Also make the troubleshooting documentation, and link the cause of the problem there.