Clarify plugin naming and usage

[hyperupcall]

In some areas, plugins are prefixed with woof-plugin-*. At other times, they are not. Unify this.

Clarify how tool selection works when a plugin only has ONE tool, or it wants to choose a tool by default.

For example, the python tool may have the tools python, micropython, jpython.

• python:{python,micropython} -> does what you expect
• python -> show tool selection menu
• python/ -> show tool selection menu
• python/:default
• python/p